TOWSON, Md. — An independent investigation into the death of University of Maryland football player Jordan McNair has determined that trainers on the scene did not follow proper procedures after he collapsed on the field.

McNair was hospitalized on May 29 after a team workout and died June 13. The family attorney said the cause of death was heatstroke.

Dr. Rod Walters, who led the investigation launched by the school, said Friday “there was a failure to identify symptoms and aggressively treat it.”