Officer Lowell Clayton Tribble, 37, was ambushed and shot dead while on patrol on August 27, 1983. Tribble was driving a marked patrol car through an apartment complex on Villa Creek Drive when a man opened fire; four shots were fired and one struck his left temple. Responding officers found his crashed patrol car in a drainage ditch. Two men were seen running from the complex after the shooting, but no suspect was apprehended at the time.

Tribble had 13 years with the Farmers Branch Police Department and had previously served two years as chief of police in Bowie. He was survived by his wife, daughter, two sons, mother, two brothers and a sister. A suspect, Gary Wayne Pettigrew, was arrested and charged with capital murder on August 27, 2010, but charges were dismissed in April 2011 and the investigation remains open.

Are there any witnesses, family members, or former colleagues who can add details about Tribble’s final patrol or the two men seen fleeing that might move the case forward?