The 21-year-old man was shot in the head at Robel Auto Repair on Meserole Street around 2:15 p.m.
He was pronounced dead at Elmhurst Hospital.
Police say the suspect pulled out a gun in broad daylight and shot the man, who the owner said was getting his car serviced at the shop.
The suspect, wearing all black with a black mask, fled on a scooter east on Meserole Street.
No arrests have been made and the investigation continues.
Few other details were released.
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