Senior Corporal Mark Timothy Nix, a 33-year-old Dallas Police Department officer and Navy veteran of Operation Desert Storm, was killed on March 23, 2007, in Dallas while attempting to apprehend a murder suspect. Nix and his partner responded to back up two plainclothes officers who had identified a car believed to have been used in a homicide two days earlier. After a short pursuit the vehicle crashed in the 4100 block of Bernal Drive and the suspect opened fire from inside the car, striking Nix in the chest, neck, and leg.

Ambulances were delayed by rush-hour traffic and another officer transported Nix to Parkland Memorial Hospital, where he died of his wounds. The suspect, Wesley Ruiz, remained in the vehicle after an exchange of gunfire, was wounded, and was taken into custody by SWAT after an about two-hour standoff. Ruiz was later convicted of capital murder and sentenced to death; he was executed on February 1, 2023. Nix was engaged at the time of his death and is survived by his fiancée, parents, and sister.

Are there any family members, colleagues, or witnesses who remember Nix or who can share details about his service and that night?