KENNETH CITY - A St. Petersburg man threw himself in front of a Pinellas Suncoast Transit Authority Bus this afternoon, killing himself, authorities said. Christopher A. Theriaut, 38, was struck by the Route 52 bus at the intersection of 49th Street N and 58th Avenue at 1:06 p.m., according to the Florida Highway Patrol. Troopers said Theriaut was kneeling on the west shoulder of 49th Street when he intentionally leaned out in front of the bus. He was pronounced dead on the scene. About a dozen passengers were on the southbound bus, but none was injured. The driver, Ronald Robinson, 38, was being treated for mental trauma but was not physically injured, authorities said. Bob Lasher, a spokesman for the PSTA, said all passengers were transferred to another bus that was following behind.