Keenan Clifford Mason, 23, was shot the night of January 26, 2020, near the Edgemont Ave Mart Deli on the 2000 block of Edgemont Avenue in Chester and died at Crozer-Chester Medical Center two days later. Police found him badly wounded, reportedly lying near the doorway or on the street outside the store with a gunshot wound to the head. Investigators recovered four shell casings and emergency responders' attempts to save him failed.

Court records describe the killing as a retaliatory ambush linked to a dispute about a firearm taken from Rashee Hunter roughly a week earlier. Testimony from Mason’s brother Kareem recounts a confrontation in which Keenan and two others allegedly took a gun from Hunter. Surveillance and phone evidence played a central role: video shows a shooter in a tan coat with a fur-lined hood, phone-location data placed Rashee Hunter and Gregory Artwell in the area, and prosecutors say 17 calls between Hunter and Artwell were manually deleted. Hunter was identified as the shooter; Artwell was alleged to have helped locate and time the ambush.

Anyone with information about Keenan, his movements that evening, or the people involved is asked to come forward.