Christman reportedly felt chest pains the day before he died while practicing and underwent an EKG at a team facility.

College football player Ben Christman's cause of death has been revealed almost three months after he was found dead at age 21. Christman — a student and football player at the University of Nevada, Las Vegas (UNLV) — was discovered deceased in his off-campus apartment on the morning of Tuesday, Feb. 11, PEOPLE previously reported.