The incident took place on the 3100 block of Stillman Street in North Philadelphia on June 27.
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Police say an argument broke out between the suspect and a 22-year-old man, who was later identified as Nadir Smith.
Both people pulled out guns and opened fire at one another, according to police.
Smith died as a result of the shooting.
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Officials said the suspect was last seen near the 2500 block of Allegheny Avenue.
If you recognize the suspect, Philadelphia police ask you to call them immediately.