with whom FABE, Justice, joins, concurring.

I agree with the result the court reaches, but write separately to discuss my concern about how our slayer statute, AS 18.12.8038, applies to negligent homicide.1

Many states have equivalent statutes, but most prevent inheritance only i#f the heir intentionally causes the decedent's death.2 Only about ten states by statute or common law forbid someone who unintentionally causes the death of another from inheriting the decedent's estate,3 and most of these states disinherit only for reckless conduct and not for negligent homicide.4 Other than Alaska, no more than four states and the District of Columbia appear to disinherit if the wrongful conduct that causes the death is merely negligent in some degree.5

*713Our statute is unusual because it potentially applies to a class of events that are predictably more likely to occur (because they involve negligence). It is also unusual because the wrongful conduct that puts family members at risk may be relatively mainstream, akin to what much of the populace commonly does. This is especially so if it involves common activities (such as driving motor vehicles) that often violate the standard of care specified by statute or regulation.6 As a result, our statute potentially applies both broadly and frequently. There is a potential for harsh results not necessarily contemplated by the drafters.

There is also a risk that the state's interests advanced by the statute are too marginal to justify interference with the testamentary expectations of the victim of negligence. But Blodgett has not challenged the statute's constitutionality. I therefore assume here that the state has sufficient interest in deterrence and public safety to bar inheritance even for negligent homicide. There is nonetheless a potential for injustice if the statute is applied harshly in a particular case.

Our statute since 1989 has contained an exception for "manifest injustice." 7 The legislature, concerned about the possible injustice of applying the slayer statute to unintentional homicides, in that year adopted an escape clause that permits a court to avoid forfeiture if it "makes special findings of fact and conclusions of law" that manifest injustice would result.8

But because the statute necessarily applies to negligent homicide, trial courts might mistakenly assume that cireumstances involving mainstream conduct well within the statute (such as negligent homicide arising out of operation of a vehicle) cannot provide a basis for finding manifest injustice. A court might likewise think cireumstances bearing on the conduct itself cannot be relevant to a manifest injustice inquiry. In my view, such a cramped interpretation of the manifest injustice standard could result in substantial unfairness in many cases. Indeed, the very frequency with which negligently operated vehicles cause death might lead some trial courts to think the cireumstances of how a vehicle was operated can never demonstrate manifest injustice. At the least, a court might apply a presumption against finding manifest injustice.

The statute does not explain what cireum-stances might justify a finding of manifest injustice. It would seem that a litigant trying to avoid disinheritance under the slayer statute should be permitted to present any arguably relevant evidence. This would include evidence relevant to the gravity of the negligent conduct or to the beneficiary's relationship with the decedent. Foreign jurisdictions whose slayer statutes also contain escape clauses permit consideration of a broad range of cireumstances. The English Forfeiture Act states: "The court shall not make an order under this section modifying the effect of the forfeiture rule in any case unless it is satisfied that, having regard to the conduct of the offender and of the deceased and to such other cireumstances as appear to the court to be material, the justice of the case requires the effect of the rule to be so modified in that case."9 One of the leading English cases considering what cireumstances might be relevant has explained:

The court is entitled to take into account a whole range of cireumstances relevant to the discretion, quite apart from the conduct of the offender and the deceased: the relationship between them; the degree of moral culpability for what has happened; the nature and gravity of the offense; the *714intentions of the deceased; the size of the estate and the value of the property in dispute; the financial position of the offender; and the moral claims and wishes of those who would be entitled to take the property on the application of the forfeiture rule.[10]

It would also seem that if a beneficiary requests findings on cireumstances that are arguably relevant to manifest injustice, the trial court should make findings as to each relevant cireumstance and explain which circumstances the court concludes are irrelevant. But Blodgett does not claim here that the trial court's findings were inadequate. Although the trial court addressed only one cireumstance-the financial effect of disinheritance on Blodgett-there was no request for findings as to any other cireumstance and there is no claim on appeal that the superior court's findings were deficient.

I therefore agree to affirm.

OPINION

I. INTRODUCTION

After being convicted of the criminally negligent homicide of his father, Robert Blodgett attempted to obtain the benefits devised to him under his father's will. Pursuant to Alaska's "slayer statute," 1 the superior court found that Blodgett was not entitled to inherit under the will as a result of his conviction, and that no manifest injustice resulted from this forfeiture. Blodgett attacks this decision on statutory and constitutional grounds. Because we agree with the superi- or court that Blodgett failed to prove that excluding him from the benefits of his father's will would result in manifest injustice, and because the superior court properly resolved the constitutional issues, we affirm that court's rejection of Blodgett's claims.

II FACTS AND PROCEEDINGS

On September 14, 2008 Robert Blodgett caused the death of his father, Richard Blodgett.2 Blodgett was indicted for murder in *704the second degree and in January 2004 he entered a plea of no contest to eriminally negligent homicide. His conviction led to a three-and-one-half-year term of imprisonment.

Blodgett was named in the final will of his father, which left "all properties, Bank accounts, stocks and insurance policies" to his children. In April 2004 Blodgett petitioned the superior court for a hearing to determine his rights to participate in the probate proceedings under the Alaska probate code and AS 18.12.8083. The other will beneficiaries consented to the hearing, but, contending that the killing of Richard Blodgett was not "unintentional," argued that AS 18.12.8038 precluded Blodgett from receiving any property under the will.

After additional briefing and a one-day evidentiary hearing, Superior Court Judge Ben Esch issued a Memorandum and Order denying Blodgett's petition and preventing him from obtaining any benefits under the will. The court explained that under AS 13.12.808 forfeiture was mandatory unless the slayer proved by a preponderance of the evidence that this would result in manifest injustice. The court concluded that Blodget failed to make such a showing. The court considered, and rejected, possible factors it thought might colorably result in manifest injustice, including past family relationships and Blodgett's monetary needs. It found the "great deal of testimony about the nature of the past relationship" between Blodgett and his father "unhelpful" and irrelevant in determining "the justice of denying or allowing recovery." It also concluded that Blodgett retained sufficient income earning capacity and property holdings that he "would not be beggared if he did not receive these funds." While the court made no specific findings as to Blodgett's culpability in his father's death, Blodgett was sentenced to three and one-half years in prison after he pled guilty to erimi-nally negligent homicide.

Blodgett appeals.

III. STANDARD OF REVIEW

Because the statutory subsection that governs this case provides that the superior court "may" set aside the application of the slayer statute if manifest injustice would result,3 we review the superior court's decision for abuse of discretion.4 We find an abuse of discretion "only if, based on a review of the whole record, we are left with a definite and firm conviction that a mistake has been made." 5

*705Constitutional challenges to a statute are questions of law.6 We review such questions de novo and will "adopt the rule of law that is most persuasive in light of precedent, reason, and policy." 7

IV. DISCUSSION

A. The Superior Court Did Not Abuse Its Discretion In Concluding That Forfeiture of the Inheritance Would Not Result in Manifest Injustice.

The common law has long followed the policy that "no one should be allowed to profit from his own wrong".8 Accordingly, many state courts exercised their equitable powers and followed this maxim in construing probate statutes to prevent inheritance by an heir who murdered the decedent.9 Over the years most states codified this rule into what became known as "slayer statutes." 10

The original Alaska slayer statute, passed in 1972,11 applied when the offender "felo-niously and intentionally kills" the decedent.12 The requirement that the homicide be intentional was taken from the common law rule and the Uniform Probate Code's articulation, both of which endorse the policy that a wrongdoer should not profit from his own wrong.13

In 1988 the legislature passed an amendment removing the words "and intentionally" from the statute.14 The amended statute on its face applied to homicides covered in AS 11.41.100 to .140 15-that is, including erimi-nally negligent homicide. The initial intent of the 1988 amendment was to prevent parents who caused the death of their child-even if recovering damages through the child's estate.16 This concern followed a case in which a parent failed to act to bring a child to the hospital (an act of criminal negligence) resulting in the child's death.17 During debate on the bill, one representative suggested that the rule apply to all homicides, not just to those perpetrated against children.18 The final draft of the amendment incorporated this suggestion by simply removing the requirement of intent.

Shortly after this amendment, Alaska Governor Steve Cowper expressed concern that under unusual cireumstances, it might be unjust to prohibit a killer from taking the *706property of the victim, such as in the case of an unintentional felonious killing.19 Accordingly, another amendment was adopted in 1989,20 creating the manifest injustice exception for unintentional homicides now found in subsection (k):

In the case of an unintentional felonious killing, a court may set aside the application of [the slayer statute] if the court makes special findings of fact and conclusions of law that the application of the subsection would result in a manifest injustice and that the subsection should not be applied.[21]

The statute also instructs that acquisitions of property not covered by the section "shall be treated in accordance with the principle that a killer may not profit from the killer's wrong.22 This has remained the law in Alaska.23 Thus, the legislature broadened the application of the slayer statute-by extending it to unintentional killings-and created an escape clause-by enacting the manifest injustice exception.24

Under the current Alaska criminal code, all unjustified forms of killing are deemed felonies. This includes murder in the first degree,25 murder in the second degree,26 manslaughter,27 and criminally negligent homicide.28 Thus, Alaska's slayer statute encompasses intentional as well as unintentional homicides.

When compared with the slayer statutes of other jurisdictions, Alaska's slayer statute emerges as unique. No other state has a manifest injustice provision for unintentional homicides. But in the great majority of other states, such a provision would be unnecessary-in these states only intentional homicides are within the statutes' reach.29 Many of these statutes are modeled after the Uniform Probate Code. Following the common-law slayer rule, the current Uniform Probate Code slayer statute applies to an "individual who feloniously and intentionally kills the decedent." 30 The comments clarify that "this section excludes the accidental manslaughter killing." 31 The Restatement (Third) of Property takes a similar position, and its formulation of the law "does not apply if the killing was reckless, accidental, or neg-*707Higent." 32

As noted, the great majority of state slayer statutes require that the homicide be intentional.33 A minority of jurisdictions resemble Alaska in merely requiring the killing to be unlawful, rather than intentional.34 But even among this minority of jurisdictions, some would only cover homicides with culpable mental states as low as "recklessness," 35 and at least one has followed a judicial opinion reading an intent requirement into its slayer statute.36 Thus, when compared to the practices of most other jurisdictions, Alaska's slayer statute has a much broader reach that would preclude inheritance for unintentional killers where other jurisdictions would not.

The legislature tempered the broad reach of AS 18.12.803 by investing trial courts with discretion to stay its application in those cases where manifest injustice would result. Should inheritance be denied to the unskilled teenager who drives his car in a criminally negligent manner and accidentally causes the death of a sole remaining parent? The legislature clearly decided that in such a case there should be discretion in the court to

consider the specific facts of the homicide and, if denial of inheritance would be manifestly unjust, to permit it. Nor does this power to avoid the rule conflict with the policy underlying the slayer rule: that a killer should not profit from the killer's own wrong.37 Where the killer's act was not intentional, and especially where the act was not even reckless, and where other cireum-stances mitigate the crime, the application of this principle may lead to unduly harsh results. Indeed, the unintended killing of a loved one, as in the example above, would likely cause the inadvertent killer far greater personal ruin than monetary gain.

In this case, Blodgett was convicted of criminally negligent homicide after a plea of no contest. This conviction conclusively established a felonious killing under the slayer statute.38 Because a criminally negligent homicide is an unintentional homicide, under subsection (k) Blodgett is entitled to avoid the effects of the slayer statute if he proves by a preponderance of the evidence that applying the statute to him will result in manifest injustice.

*708We have not had occasion to define the phrase "manifest injustice" as used in the slayer statute, or to set out the relevant factors that a trial judge should consider when ruling on this question. Similarly, because no other state slayer statute contains a provision similar to subsection (k), out-of-Jurisdiction case law provides no ready assistance. However, the Alaska Court of Appeals has interpreted this phrase in another, similar context. In criminal presumptive sentencing, the legislature enacted a "safety valve" provision that permits review of a sentence by a special three-judge panel upon a showing of manifest injustice.39 In Smith v. State,40 the court of appeals equated manifest injustice with that which is "plainly unfair." 41 Later, in Belts v. State,42 the court of appeals held that a presumptive term cannot be manifestly unjust "in general" but only "as applied to a particular defendant." 43 Before finding manifest injustice, the court held that the "judge must articulate specific cireumstances that make the defendant significantly different from a typical offender within that category or that make the defendant's conduct significantly different from a typical offense." 44 We adopt Beltz's approach for the purpose of applying subsection (k) of Alaska's slayer statute.

Thus, the relevant comparison here is between Blodgett's conduct and that of a typical offender convicted of negligent homicide. In the criminal proceedings, Blodgett was sentenced to three and one-half years in prison. This sentence approaches the presumptive term for second felony offenses, suggesting that the superior court did not believe Blodgett's acts fell at the lowest level of culpability for a negligent homicide.45 Given the length of the sentence, we are reassured that the court below considered Blodgett's conduct in relation to other similarly situated defendants when it rejected Blodgett's claim of manifest injustice.

Blodgett attempted to prove that enforcement of the slayer statute would result in manifest injustice by introducing evidence regarding (1) past family relationships, and (2) possible impecunity if denied the benefits of inheritance. The court found that Blod-gett failed to meet his burden of proving, by a preponderance of the evidence, extraordinary cireumstances that would have made it manifestly unjust to exclude him from his father's will. We agree.

The court described the evidence regarding family relationships as "unhelpful." While the court's statement that the "nature and quality of the relationship between these parties during life seem unrelated to the fairness of allowing the killer to benefit after the decedent's death" may be a narrow interpretation of the relevance of past relationships generally, we do not believe it was an abuse of discretion under the cireumstances of this case. Witnesses testified that Blod-gett and his father shared a relationship of "tough love," a "good relationship" marked with occasional "squabblings" typical of father-son relationships. Such testimony neither proves nor refutes the fairness of forfeiting Blodgett's inheritance. The court did not abuse its discretion in deciding that Blod-gett failed to prove manifest injustice on this ground.

The court also examined Blodgett's argument that "it would be unjust to deny benefits under the will to someone who is physically disabled, who faces unknowable future medical expenses, who has a compromised earning capacity and has ongoing psychological needs." The superior court noted that, although Blodgett suffered some medical disabilities, Blodgett's own witness testified that he "is adept at the operation of heavy equipment and has skills as a mechanic." The *709court found that these skills could lead to employment with yearly compensation ranging between $40,000 and $50,000 per year. It also found that Blodgett owns other property and that future medical expenses will likely be met through the Alaska Native Health Service. In light of this testimony, the court concluded that Blodgett "would not be beggared if he did not receive these funds." Consequently, the court found that Blodgett failed to prove manifest injustice based on monetary need.

While we believe the court did not abuse its discretion in making this determination, we are concerned that the court's analysis could lead to the conclusion that a showing of manifest injustice may turn on predictions concerning the future financial health of the petitioner. Such an approach would allow slayers of their decedents to inherit if they are poor, but not if they are financially solvent. We doubt that this distinction-between different slayers based on their personal wealth-reflects the legislature's purpose in enacting the manifest injustice provision.46

Despite these concerns, we conclude that the superior court did not abuse its discretion in finding that Blodgett failed to prove manifest injustice by a preponderance of the evidence.

B. Application of the Slayer Statute Did Not Violate Blodgett's Constitutional Rights.

Blodgett argues that the slayer statute violates several of his constitutional rights, including his right to due process, his right to avoid "forfeiture of estate," and his rights under the ex post facto clause.47 We consider each in turn.

1. Due process

Blodgett argues that the superior court's application of the slayer statute violated his due process rights protected by article I, section 7 of the Alaska Constitution.48 Due process requires that a party receive adequate notice and an opportunity to be heard before being deprived of life, liberty, or property by adjudication.49 Blod-gett argues that "[alt present, nothing is protecting Robert Blodgett's due process right to obtain access to the court, access to discovery and receive a fair hearing."

Blodgett requested and obtained a hearing with the superior court. He then filed advance briefing and presented evidence and arguments in front of a judge. These procedures would appear to dispose of any due process argument. Blodgett's position, however, is centered on the assertion that he held de fucto partnership or joint venture interests in his father's business. He argues that his due process rights were violated by not having an opportunity to present evidence regarding these alleged interests.

There are numerous problems with this due process argument. First, Blodgett had a hearing in front of the superior court and failed to present any evidence regarding these alleged partnership or joint venture *710interests. Second, Blodgett's assertion on appeal regarding these interests appears entirely unsupported; he points to no evidence in the record to support it. In fact, what little evidence there is in this case suggests otherwige-a letter from Blodgett to his sister after his father's death suggests that Blodgett did not have any partnership interest in the father's business.50 Finally, even if Blodgett has a tenable argument for a partnership interest, it is not clear that the slayer statute would cause him to forfeit his own share of the partnership. For these reasons, we reject Blodgett's due process argument.

2. "Forfeiture of estate"

Blodgett next contends that the application of the slayer statute resulted in a "forfeiture of estate" in violation of article I, section 15 of the Alaska Constitution. That section provides:

Prohibited State Action. No bill of attainder or ex post facto law shall be passed. No law impairing the obligation of contracts, and no law making any irrevocable grant of special privileges or immunities shall be passed. No comviction shall work corruption of blood or forfeiture of estate.

(Emphasis added.) These provisions respond to certain practices and doctrines inherited from England.51 Attainder existed at common law; it was "the act of extinguishing a person's civil rights when that person is sentenced to death or declared an outlaw for committing a felony or treason." 52 Incident to attainder and as punishment for the crime, the felon forfeited all of his lands and chattels to the state.53

We affirm the superior court's rejection of Blodgett's "forfeiture of estate" claim on both procedural and substantive grounds. Procedurally, Blodgett waived his argument by inadequately briefing the issue. In his brief he alleged that the "slayer statute ... works a forfeiture" and cited article I, section 15 of the Alaska Constitution, but he did not construct any argument as to why that section should invalidate Alaska's slayer statute.54 Substantively, the law is clear-and many states have held-that the "forfeiture of estate" clause is not implicated by the slayer rule.55 Several rationales support this conclusion. First, any loss caused by a slayer statute is not improperly based on attainders or on the legal status of a felon; rather, the slayer statute exists to effectuate the accepted policy that a killer should not profit from his wrong.56 The rule does not prevent the slayer from inheriting in general; it only prevents the slayer from inheriting from the slayer's victim. Second, courts have noted that the application of the slayer rule does not actually cause a forfeiture, because the offender did not own the property at the time of the homicide; he merely had an expectancy interest.57 By killing the decedent, the slayer prevents the property interest from vesting in himself.58 Third, the constitutional *711language suggests that it covers complete forfeiture, but even assuming that something is forfeited as the result of application of the slayer statute, it is not the entire estate, but merely "some" property.59 Finally, the slay er statute differs from the effect of attainder in that it generally results in the estate going to the other heirs, not to the government.60 Because the "forfeiture of estate" clause is clearly inapplicable, Blodgett's argument here must fail.

3. Ex post facto clause

Blodgett next argues that application of the slayer statute violated the ex post facto clause of the same constitutional provision.61 An ex post facto law is a law "passed after the occurrence of a fact or commission of an act, which retrospectively changes the legal consequences or relations of such fact or deed.62 It is unclear whether the ex post facto clause applies to purely civil statutes.63 However, because the slayer statute is arguably punitive, there is at least a plausible argument that it could apply in this seenario.

But Blodgett cannot prevail on such an argument, because his claim concerns a non-probate asset: his father's life insurance policy. Shortly after Blodgett's plea, the New York Life Insurance Company sent Blodgett a letter stating that the Alaska slayer statute disqualified him from obtaining any benefits under the life insurance policy, executed in 1985. Blodgett's position is that his rights under this insurance contract were impaired retrospectively by the subsequent passage of the slayer statute. We need not reach this argument, for there has been no adjudication with regard to the life insurance policy.

Life insurance policies are non-probate transfers.64 Thus, that Blodgett has been excluded from probate under a slayer statute does not necessarily exclude him from obtaining life insurance benefits.65 Blodgett has not sued the New York Life Insurance Company to challenge its decision to disqualify him. Without such a challenge, whether the slayer statute applies to non-probate transfers was not before the superior court-as that court recognized-nor is it before us. Accordingly, there is no occasion for us to consider whether such an application would violate the ex post facto clause.

v. CONCLUSION

Because the superior court did not abuse its discretion in concluding that manifest injustice would not result from application of the slayer statute, and because Blodgett's constitutional challenges to the slayer statute *712are unavailing, we AFFIRM the decision of the superior court.