Police arrested a St. Petersburg teen on charges he shot a man in the back of the head on Martin Luther King Jr. Day.
Charles Diego Dorns Jr., 17, was already in the Pinellas County Jail on several robbery charges when police arrested him in the Jan. 20 homicide, authorities said.
On that day, in the 1900 block of 20th Street S, detectives said a man came up behind Arsenio Brinson, 26, and shot him in the back of the head with a handgun and ran off.
Brinson died at the scene.
Officers also found a second victim at the scene who had been shot below his waist. He was taken to Bayfront Health St. Petersburg with injuries that were not life threatening.
Detectives were still trying to determine the motive for the shooting.