Pittsburgh Steelers quarterback Dwayne Haskins has died at just 24 years old. The athlete passed away on Saturday morning after being struck by a dump truck while he was walking on a South Florida highway, law enforcement told the Associated Press. Steelers head coach Mike Tomlin shared his sorrow in a statement on Twitter. "Dwayne was a great teammate, but even more so a tremendous friend to so many. I am truly heartbroken," he wrote in part.