Criss Knight, 50, was shot to death while driving his truck in Houston on November 9, 2012. According to investigators, a black SUV pulled up at the intersection of Duane and Clover streets, a passenger exited Knight’s vehicle and shot him in the head, then fled in the SUV. Nothing was taken from Knight, prompting suspicion the attackers may have known him rather than acting in a simple robbery.

Ballistics tied the gun used in Knight’s killing to another homicide less than a month earlier, the death of John Martinez, but police emphasized differences between the cases: Martinez appeared to be a robbery victim, while Knight’s death showed no apparent theft motive. Knight was described as a well-liked plumber; his family said they did not know of any enemies.

The Houston Police Department and Crime Stoppers offered a reward and the Cold Case Squad continues to review the case. If anyone has information about Criss Knight’s killing or the black SUV and its occupants, please come forward.