ST. LOUIS • Prosecutors on Monday charged a St. Louis man in a fatal shooting late Saturday night at a pizza shop in St. Louis.Glenn Pickett, 30, of the 4900 block of Wabada Avenue, was charged with first-degree murder, armed criminal action and unlawful possession of a firearm. He was being held Monday without bail.Police responded to calls of shots fired about 11:55 p.m. Saturday at Domino's Pizza in the 1400 block of North Kingshighway. Police found Flynt Clemons, 28, of the 3800 block of Greer Avenue, suffering from gunshot wounds to his chest, back, hand and leg. He died at a hospital.Police said in court documents that Clemons had an argument with a cashier over the change due for a purchase, and she called her boyfriend, Pickett. Police said Pickett showed up and shot Clemons several times, then followed him outside and and kept shooting him in front of Clemons' girlfriend and children.Pickett's criminal history includes convictions of unlawful use of a weapon, stealing a vehicle and first-degree tampering, court documents say.