The preliminary investigation reveals Walker was pumping gas in the 2900 block of Colebrook Drive when he was approached by Duane Lamar Williams, 34, who brandished a gun. The gunman chased Walker across Branch Avenue and shot him multiple times. A second victim was in a nearby car at the time. That victim was an off-duty Metropolitan Police Department officer. He exited the car and identified himself as a police officer and attempted to make an arrest. At that time, Williams pointed his gun at the man and attempted to fire, but the gun would not discharge. The second victim was not hurt.
Patrol officers found Williams nearby and based on his erratic behavior, believed him to be high on PCP. They deployed their Tasers multiple times to try and subdue the gunman. None of the applications took effect, which is a common occurrence when someone is under the influence of PCP. The patrol officers were able to then arrest the gunman. Patrol officers recovered the murder weapon from the suspect. Williams is charged with first and second degree murder and related charges.