Francisco Velez, 32, was fatally shot in the early morning of September 4, 2015, in Clio, Michigan, in a dispute that began at a party on Pine Street and escalated at a nearby mobile home park. The confrontation followed when a friend of David B. McQuillan was asked to leave the gathering; McQuillan and others went to the mobile home park, and two men from the party, including Velez, arrived there in a vehicle. During an argument, McQuillan retrieved a .22-caliber rifle from his residence and fired a single shot that struck Velez in the back as he was reportedly getting back into the vehicle.

The bullet hit a major artery, and Velez was later pronounced dead at a local hospital. McQuillan fled but was apprehended shortly afterward in a wooded area near his home. A jury found McQuillan guilty of second-degree murder, felony firearm, and being a felon in possession of a firearm; the murder conviction carries a minimum 20-year term, with an additional two years for the felony firearm count.

Was anyone at the party or the mobile home park that night able to provide details that could clarify how the argument escalated?