Columbia, Mo. ? A Missouri football player who died after collapsing at the end of a preseason workout wasn’t taken immediately to the hospital across the street but instead driven to the team offices, a university police report shows.

Aaron O’Neal, 19, was “in full cardiac arrest” by the time campus police officer Clayton Henke and University Hospital paramedics arrived July 12 at the Tom Taylor Building, Henke wrote in a police report obtained by the Associated Press under Missouri’s public-records law.

“He was brought to our door in the back of a pickup from afternoon workouts,” athletic trainer Greg Nagel told emergency dispatchers in a 911 call from the Taylor building, according to a copy of the call obtained by the AP. “We need someone here in a hurry.”

Both University Hospital and the Taylor building are across the street from Faurot Field, but on opposite sides.

Fifteen minutes after Nagel’s call to 911, Henke was sent to the scene at 3:24 p.m., nearly one hour after the conclusion of the hourlong voluntary workout.

O’Neal, 6-foot-3 and 220 pounds, started to struggle during conditioning drills about 45 minutes into the session, during which players wore shorts, T-shirts and football cleats, but no helmets or pads.

The backup middle linebacker slumped to the ground after the final drill and was helped off the field by a teammate.

O’Neal was unconscious when he arrived at the Taylor building, assistant athletics trainer Alfred Castillo told university police.

O’Neal was taken there rather than the nearby hospital “so that O’Neal could be seen by staff members,” Henke wrote.

It was not clear exactly when O’Neal fell unconscious.

O’Neal was pronounced dead at the hospital at 4:05 p.m., or just over 90 minutes after the workout ended.

The Boone County medical examiner completed an autopsy the day after O’Neal’s death and ruled out infection, trauma and foul play as causes of death. Complete results won’t be available for several weeks, pending toxicology tests and other laboratory analysis.

But while the final report remains incomplete, the county’s deputy medical examiner said the circumstances surrounding O’Neal’s death required systematic changes to the way such workouts were conducted and monitored.

“Clearly, everybody felt that this was just athletic fatigue and he felt fine,” said Eddie Adelstein, who is also an associate professor of pathology at Missouri. “You don’t have to be a rocket scientist to say that anyone who shows fatigue at the level he did, the rational thing would have been to stop and examine him.”

University officials said Tuesday that they wouldn’t discuss the events leading up to O’Neal’s death until after an internal review was complete.

Three of Missouri’s five athletics trainers were at the July 12 workout, according to a football team news release issued the next day. University officials declined to say whether any trainers left the workout early or accompanied O’Neal in the pickup that took him to the Taylor building.

O’Neal had a pulse inside the car, Castillo told police. Once inside the athletics building, O’Neal’s pulse further weakened. When Castillo couldn’t identify an auditory heart beat, he attached an automatic defibrillator to O’Neal in an attempt to shock him back to life, according to the report.

Paramedics arrived before Castillo could do so. They performed chest compressions in the ambulance and administered CPR en route to the hospital.

Tigers coach Gary Pinkel has said he didn’t plan to change the way summer workouts were conducted.