22-year-old Steven Miller is wanted in the fatal shooting of 24-year-old Maurice Kimble of Upper Darby.
Police say Miller and Kimble got into argument over a woman at the PYT burger restaurant at the Piazza at Schmidt's shortly after midnight Monday.
The dispute spilled out to the edge of the courtyard.
Kimble was shot at least three times in his neck and chest.
The gunman was seen running away with another man and two women.
Police collected surveillance video from the restaurant and surrounding streets.
Miller is described as a black male, 6' tall, 150 pounds, with black hair and brown eyes.
Anyone with information on his whereabouts is asked to call police at 215-686-3334/3335.