Details in the death of Maryland football player Jordan McNair have emerged in a new investigative report by ESPN published Friday.

Heather Dinich writes that McNair showed signs of extreme exhaustion and had difficulty standing upright while running a set of 110-yard sprints during the May 29 workout that resulted in him going to the hospital. McNair’s family has publicly called heatstroke the cause of death and now sources have confirmed to Dinich that’s what killed the Terrapins offensive lineman.

Maryland has hired former athletic trainer Dr. Rod Walters to lead its investigation of McNair’s death. The family has also enlisted Baltimore law firm Murphy, Falcon & Murphy to investigate.

The firm’s investigation so far has found that the offseason workout, supervised by the conditioning staff, began at 4:15. At around 5 p.m., McNair suffered a seizure. ESPN found the 911 call was made at approximately 5:58 p.m., prompting questions of what happened during the unaccounted hour in the timeline.

“Our preliminary investigation reveals there is an unexplained one-hour time period when nothing significant was done to avoid the complications of heatstroke,” attorney Billy Murphy told ESPN. “Although there is some evidence they allegedly tried to cool him down, he should have been iced immediately. He presented at the hospital with a temperature of 106, which means he was not cooled down.

“We’re very concerned about the unexplained one hour between the time of the seizure and hyperventilating that was observed by a coach, and what happened in that remaining hour before the EMT people were actually called. This points to an utter disregard of the health of this player, and we are extraordinarily concerned that the coaches did not react appropriately to his injury.”

It is noted that heatstroke can occur when the body temperature reaches 104 degrees.

Maryland officials told ESPN they have no record of a McNair having a seizure at 5 p.m. that day.

“At no point before or during the external review has a student-athlete, athletic trainer or coach reported a seizure occurring at 5 p.m. We will be able to speak in greater detail when the review is complete and shared with the public. Our consultant has work to do to finish this investigation. We will take appropriate action when we have the full details. Our thoughts remain with Jordan McNair’s family, friends and teammates.”

The ESPN report also includes anonymous player observations and recollections of McNair attempting to complete the assigned 10 110-yard sprints.

“Jordan was obviously not in control of his body. He was flopping all around,” one player told ESPN. “There were two trainers on either side of him bearing a lot of weight. They interlocked their legs with his in order to keep him standing.”

The full report is available here.