Shawn Richard Bullock was 22 and living in Gilbert, Arizona, when he disappeared on July 21, 1998. He was last seen leaving his home at about 7:00 p.m. after telling a roommate he needed to run an errand. Shawn never returned and was not heard from again.

Attention focused on his black Cadillac DeVille, found unoccupied several miles away near South 29th Street and East Roeser Street in Phoenix. Investigators reportedly found Shawn’s blood and brain matter in the vehicle and the passenger-side window was missing, but Shawn himself and his remains were not located with the car. The Phoenix Police Department has said evidence in the Cadillac indicated he had been the victim of a homicide, though his body has not been recovered.

Shawn’s disappearance occurred days after he received a subpoena to testify in cases tied to brothers Luis Anthony Cisneros and Felipe Cisneros; other witnesses in that circle had been threatened or killed. Does anyone who knew Shawn or saw his Cadillac after July 21, 1998, have information to share?