Bryan Peter Foshay was found guilty of the first-degree murder of Brian Blackwell on Wednesday in Pima County Superior Court.
Blackwell was found dead in his east-side condo in January 2012 with a single gunshot wound to the head.
Investigators matched the bullet to a gun Foshay owned.
Foshay is scheduled for sentencing on June 9.
Read more about the trial here and in Thursday's Arizona Daily Star.