Authorities say 44-year-old Dameon Anderson is charged with murder.
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Investigators say he opened fire after an argument inside the Market Grocery in the 4000 block of Market Street on April 6.
The victim was identified as 26-year-old Savion Pollard-Poulson.
Anderson allegedly fled the scene on a motorized scooter.
He was recently sighted in Atlantic City, New Jersey.
The U.S. Marshals Service is offering a $1,500 reward for information leading to his arrest.
Anyone with information can call or text Philadelphia police at 215-686-TIPS (8477) or submit an anonymous tip online.