*469 ORDER AND JUDGMENT *

Shireen Disel Nalley appeals the dismissal of her claims against Joanne Burness, a medical professional, who Nalley alleges falsely testified as to Nalley’s competence to stand trial. 2 Nalley also seeks to hold several additional parties vicariously liable. Pursuant to 28 U.S.C. § 1915(e)(2) and Federal Rule of Civil Procedure 12(b)(6), the district court dismissed Nalley’s complaint. Exercising jurisdiction under 28 U.S.C. § 1291, we affirm for substantially the same reasons given by the district court.

Nalley explains neither the circumstances leading up to Burness’ testimony nor the nature of the proceeding in which Burness testified. However, she alleges that Burness told her in private that she was incompetent, but then testified to the contrary in court. Seeking damages of $75,000.01, Nalley filed suit in United States District Court for the District of New Mexico. Interpreting her complaint as a civil rights action brought under 42 U.S.C. § 1983, the district court dismissed Nalley’s claims against Burness because Burness is entitled to absolute immunity as a witness. It dismissed her claims against the remaining defendants because they could not be held liable under a re-spondeat superior theory. Having thus dismissed all federal claims, the district court declined to exercise supplemental jurisdiction over Nalley’s state law claims.

Because she proceeds pro se, we construe Nalley’s pleadings liberally. Hall v. Bellmon, 935 F.2d 1106, 1110 (10th Cir. 1991). But the court will not “assume the role of advocate for the pro se litigant.” See id. Although the district court interpreted Nalley’s amended complaint to assert claims under § 1983, given its references to negligence, intentional tort, and medical malpractice, as well as the amount of the claimed damages, Nalley may have been attempting to invoke the court’s diversity jurisdiction, see 28 U.S.C. § 1332. However, the record indicates that all parties are citizens of New Mexico and thus not diverse. Symes v. Harris, 472 F.3d 754, 758 (10th Cir. 2006).

Further, we conclude that Nalley has also failed to state a claim under 42 U.S.C. § 1983 for the reasons given by the district court. Witnesses are absolutely immune from suits under § 1983 arising out of their testimony. Briscoe v. LaHue, 460 U.S. 325, 345-46, 103 S.Ct. 1108, 75 L.Ed.2d 96 (1983); Miller v. Glanz, 948 F.2d 1562, 1570 (10th Cir. 1991). Nor can § 1983 liability be based upon a mere supervisory or employment relationship. Duffield v. Jackson, 545 F.3d 1234, 1239 (10th Cir. 2008). Accordingly, the district court correctly dismissed both the claims against Burness and those against the other defendants. Having properly dismissed Nalley’s federal claims, the district court permissibly declined to exercise supplemental jurisdiction over any state law claims. 28 U.S.C. § 1367(c)(3).

For the foregoing reasons, the dismissal of Nalley’s complaint is AFFIRMED. Her request to proceed in forma pauperis *470 on appeal and all other pending motions are DENIED.