It happened around 1 a.m. Monday on Leahy Avenue and North American Street.
Officers who arrived found the victim in their car with the engine running.
There were three shell casings near the car, police said.
At least one bullet hit the victim in the head.
The victim was taken to hospital, where he was pronounced dead.
The suspect remains at large.
Police are looking for surveillance cameras in the area that could have recorded the shooting.
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