By Andrew Holleran Dwayne Haskins, the former Ohio State Buckeyes star who played for Washington and Pittsburgh in the National Football League, died on Saturday. He was 24. According to the authorities, Haskins, who was training in South Florida with Steelers teammates, was killed when he was struck by a truck on a highway early Saturday morning. It’s unclear why Haskins was on the road, but he was believed to be attempting to cross the highway when he was struck. “He was attempting to cross the westbound lanes of Interstate 595 when there was oncoming traffic,” FHP spokeswoman Lt. Indiana Mi…