Demarcus Trey Allen, 23, was fatally shot on June 5, 2019, in an apartment at the Village on Telluride in San Marcos, Texas. He was a guest in the unit and was found dead in the living room after officers responded in the early morning to a resident who had followed a loose dog to an apartment with a kicked-in door. Allen had been asleep when he was shot.

Surveillance video mounted inside the apartment captured the incident. Investigators say two armed men, Jon Jervis and Lapear Willrich, forced entry; Allen attempted to defend himself with a gun, and Jervis fired the fatal shot. The suspects fled in a white Cadillac and were later arrested and charged with capital murder. Jervis and Willrich were convicted and received life without parole sentences in 2022 and 2023, respectively.

The case underscores how domestic surveillance evidence can be decisive in identifying perpetrators and securing convictions.