Derek Cooper Jr., 28, was found shot to death the night of April 10, 2015, inside an apartment in the 200 block of South Sixth Street in downtown Las Vegas. Officers were called about 8:30 p.m. after reports of an argument and gunfire; two men were seen running from the building moments later. The Clark County coroner ruled the death a homicide from gunshot wounds to the chest and noted multiple gunshot wounds.

Detectives said Cooper had argued with two men just before the shooting and asked the public for help locating 63-year-old Ivory Pops Hawkins for questioning, though police did not immediately say whether he was one of the two seen fleeing. Weeks later Hawkins was found dead off a frontage road near Summit, Utah, and investigators obtained a section of his femur to compare DNA to blood found in a car tied to the inquiry. Court affidavits also recount witness statements alleging that Jacktorian Harvey had been inside the apartment and shot Cooper during a robbery planned by Hawkins; Harvey was arrested April 30 on drug-trafficking charges but was not then charged in the killing and no homicide arrest had been announced.

If anyone witnessed the argument, the shooting, or saw people running from the building that night, please share what was seen.