GREENSBURG, Pa. (AP) — An attorney for a Pennsylvania man serving a life term in the murder of a romantic rival almost six years ago says an appeal could hinge on finding a missing eyewitness.

Thirty-nine-year-old Raymond Rivera was convicted of first-degree murder in the October 2011 death of 37-year-old John Evans. He testified that he acted in self-defense.

The Pittsburgh Tribune-Review (http://bit.ly/2vC7PEl ) reports that defense attorney Tim Andrews asked Friday that a taxpayer-funded private investigator be appointed to help find a witness he contends will say that Evans was armed.

Prosecutors said there was no evidence that anyone other than Rivera had a weapon. They said the former professional boxer believed Evans was romantically involved with his girlfriend. Assistant District Attorney Larry Koenig called it "a textbook case of deliberate, intentional murder."

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Information from: Tribune-Review, http://triblive.com