Mark Gretler, 61, was shot and killed at his home on Olivewood Drive in Pittsburg, California, on July 27, 2018. Police were summoned by a family member shortly after 10 a.m.; officers found Gretler with a gunshot wound to his upper torso and lifesaving efforts by officers and medical crews were unsuccessful.

Authorities identified roommate Rolando Aquino, 61, as the primary suspect after the two men’s history of confrontations culminated in a fatal argument that morning. Aquino fled before police arrived; surveillance later showed him in Pittsburg and San Pablo leaving his car near the San Pablo Casino. The Pittsburg Police Department issued a murder arrest warrant describing him as armed and dangerous.

A manhunt continued until Aquino was arrested on March 11, 2019, in Oakland; Edna Aquino, 60, was also arrested as a suspected accessory. The investigation remained open and police asked anyone with additional information to come forward. Does anyone have information about Gretler, his movements that morning, or contacts who might help clarify what led to this argument?