Maryland offensive lineman Jordan McNair showed signs of extreme exhaustion, had difficulty standing upright while running a set of 110-yard sprints and was found to have a body temperature of 106 degrees at a local hospital before he died of heatstroke suffered during a football workout, multiple sources told ESPN. The 19-year-old from Randallstown, Maryland, collapsed during an outdoor Terrapins workout on May 29. He died two weeks later. No cause of death has been officially released, but ESPN has learned of an official heatstroke conclusion and new details about what happened to McNair based upon interviews with multiple sources in and close to the Terrapins program, as well as two witnesses to the workout. McNair's death and whether university coaches and officials followed proper protocols after he became distressed are being investigated by Dr. Rod Walters, a university-hired, former longtime collegiate athletic trainer. Walters' report is expected to be released Sept. 15....