On the evening of April 29, 2020, a backyard dispute on the 1900 block of East Lewis Street in Pasco, Washington, erupted into gunfire and left 29-year-old Hispanic man Luis Contreras dead. Contreras and two other men were present when an argument with another group escalated; witnesses reported hearing as many as ten shots. Officers arriving shortly before 6 p.m. found Contreras with multiple gunshot wounds and he was pronounced dead at the scene. Two other men were wounded and taken to local hospitals.

Investigators quickly identified three suspects: Antonio Larios Jr., then 18, and brothers Miguel Angel Montalvo, 21, and Juan M. Montalvo, 25. Larios was arrested in Granger within days. Nearly three weeks later the Montalvo brothers returned to the Lewis Street home, forced their way in and opened fire, wounding two people. They then carjacked a vehicle and later engaged police in an alley shootout; Juan Montalvo was killed and Miguel Montalvo was seriously wounded. Larios later pleaded guilty to first-degree manslaughter and assault; Miguel Montalvo also pleaded guilty to numerous offenses and received a lengthy sentence.

Did anyone in Pasco know Luis Contreras or witness the April 29 confrontation?