MIAMI — Pittsburgh Steelers quarterback Dwayne Haskins was killed in an early morning crash Saturday, his agent Cedric Saunders told ESPN’s Adam Schefter. According to ESPN, Haskins, 24, was in South Florida training with other Steelers quarterbacks, running backs and wide receivers. He was struck and killed by a vehicle Saturday morning. Haskins, who’s originally from New Jersey, became one of the most sought-after high school quarterbacks in the country at Bullis in Potomac, Maryland, and committed to the Ohio State Buckeyes. After two years on the bench in Columbus, Haskins was one of the b…