Published: Sep 03, 2013 4:00 PM EDT

BELLE GLADE, Fla. (AP) - A former high school football star has been sentenced to life in prison for fatally shooting a South Florida grocery store owner.
A Palm Beach County judge sentenced 21-year-old Corey Graham Jr. on Tuesday. The Palm Beach Post ( ) reports that he was convicted last month of first-degree murder with a firearm. Graham had once been a standout on the football field at Glades Central High School.
Authorities say Graham was wearing a mask in January 2012 when he robbed 49-year-old Jimmy McMillan's Belle Glade store. The owner was later found lying on the floor. The impoverished community rallied, and tips led to Graham's arrest.
Residents said McMillan often gave credit to people without cash and cooked meals for unemployed.
The store was started in the 1940s by McMillan's ancestors.
Information from: The Palm Beach (Fla.) Post,

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