The shooting happened on June 30, around 3:17 a.m., on the 1400 block of Kerper Street.
Police say 43-year-old Carlton Brown was found shot in the head. He was pronounced dead at the scene.
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On Monday, investigators released an image of the alleged gunman.
He was last seen fleeing on a bicycle while wearing a black hoodie featuring a picture of Marilyn Monroe in a Philadelphia football jersey with the number 11.
Anyone with information is asked to call police at 215-686-TIPS.