Quentin L. Patrick, 22, is charged with murder and three counts of assault and battery with intent to kill, Patterson said.
Patrick has multiple convictions for possession with intent to distribute, is a felon and is prohibited from possessing a firearm, police said.
First Assistant U.S. Attorney Kevin McDonald said Saturday he will ask the federal Bureau of Alcohol, Tobacco, Firearms and Explosives to investigate. Patrick and his live-in girlfriend, 19-year-old Ericka Patrice Pee, are being held at Sumter-Lee Regional Detention Center.
They were home with her 2-year-old daughter and tried to leave after the shootings, after grabbing $7,500 in bundled cash, police said. Pee is charged with obstruction of justice.
"Patrick admitted to law enforcement that he fired his AK-47 weapon, emptying the weapon," Patterson said. "Patrick advised law enforcement that he had been shot before and would not be shot again." He also feared being robbed, he told police.
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