Officers found the alleged shooter walking naked after he ditched his clothes in a portable toilet, police said.

Ethan Nieneker went on a deadly rampage Monday afternoon in Austin, Texas, killing a Target employee, a 66-year-old man and his 4-year-old granddaughter.

Nieneker then ran to a Jeep Cherokee and began firing as it drove away, police said. Nieneker next turned his gun toward a gray Toyota 4-Runner, shooting and killing 65-year-old Adam Chow and Chow’s 4-year-old granddaughter, who was in the backseat, a police statement said. Chow’s wife, who was also in the car sustained minor injuries.