The shooting happened just after 6:30 p.m. in the 1300 block of Snyder Avenue, police say. It involved a Route 79 bus.
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The video shows the suspect and a 37-year-old man start fighting on the bus.
The suspect then exits the bus, pulls out a gun, and shoots the victim through the doorway.
The suspect is then caught on video entering the SEPTA station at Snyder Avenue and Broad Street.
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He was last seen getting on a Broad Street Line train heading south.
Anyone who recognizes the suspect is asked to call police.
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