articleThe Brief Police arrested an 18-year-old man after a deadly gun deal inside a St. Petersburg YMCA bathroom Wednesday afternoon. St. Petersburg police arrested an 18-year-old man following a fatal shooting during a gun transaction inside a YMCA bathroom Wednesday, while officers continue searching for a second suspect. St. Petersburg police shooting responseWhat we know:Police received a call shortly before 2:10 p.m. Wednesday regarding a shooting at the Childs Park YMCA, located at 691 43rd St South. According to the St. Petersburg Police Department, the victim and another 18-year-old man traveled from Clearwater to St. Petersburg to purchase a gun. They met 18-year-old My' Kiese Johnson of St. Petersburg and another man inside the YMCA bathroom to complete the deal.