It happened around 4 p.m. Monday on the 2200 block of North Broad Street.
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Police say the 38-year-old customer was shot four times during the altercation with the suspect.
The victim was rushed to an area hospital where he later died.
No arrests have been made.
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No other injuries were reported.
Anyone with any information is asked to call police at 215-686-TIPS.
At least 12 people were shot in Philadelphia from Monday afternoon to night.