articleThe Brief Police arrested an 18-year-old man who turned himself in Tuesday following a deadly shooting inside a St. Petersburg YMCA bathroom. The shooting happened last week during an alleged gun transaction and robbery at the Childs Park YMCA, according to the St. Pete Police Department. St. Pete deadly YMCA shootingWhat we know:Police said that Jeremiah Peterson, 18, of St. Pete, turned himself in on Tuesday. The backstory:According to investigators, the victim and another 18-year-old man traveled from Clearwater to St. Pete to buy a gun. Investigation, Childs Park YMCA statusWhat we don't know:Police have not released the identity of the victim.