Mark Marshall, 34, was shot and killed while walking his two Chihuahuas on the evening of December 16, 2015, on the 4600 block of Kingsessing Avenue in West Philadelphia. Marshall worked for the Philadelphia Parking Authority and was in the process of becoming a Philadelphia police officer. He was taken to Presbyterian Hospital and pronounced dead.

Witnesses reported a confrontation with a man who exited the passenger side of an older silver or light-colored Dodge or Chrysler minivan. The suspect was described as a Black male, about 20 to 30 years old, medium build, with a beard, wearing a light-colored hooded sweatshirt and an orange wool hat. He allegedly shot Marshall multiple times, then rejoined the minivan and fled the scene.

The city offered a $20,000 reward that was later increased to $32,500 through donations from the Philadelphia Parking Authority and its union. Authorities released a suspect sketch and a photo of the vehicle, but no arrests have been announced and the case remains unsolved. If anyone knew Marshall or has information about the man or the minivan, please come forward.