It happened on July 12 along the 3100 block of Kensington Avenue.
Investigators released surveillance video of the incident on Wednesday.
Police say the suspect robbed the victim inside a convenience store.
When the victim confronted the suspect outside, police say the suspect shot him in the neck.
The suspect was then reportedly seen fleeing the area on a blue and silver Trek mountain bike.
Anyone with information on the suspect in this incident is urged to contact Philadelphia police immediately.
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