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STILLWATER, Okla. – An Oklahoma university is mourning the tragic and sudden loss of a basketball player.

Tyrek Coger, 21, had just transferred to Oklahoma State University from Cape Fear Community College in North Carolina.

He was rated as the 21st best junior college prospect in the nation, averaging 12 points and seven rebounds a game.

He signed with OSU on June 27, and was on campus for just two weeks before tragedy struck.

University officials say Coger was participating in a workout at Boone Pickens Stadium around 5 p.m. on Thursday.

Authorities say Coger did not appear to be struggling during the workout, but sat down at the top of the stairs when the workout finished.

At that point, other players and staff members went over to him and noticed that something was wrong.

Immediately, trainers called 911 and firefighters arrived at the stadium less than five minutes later.

A short time later, he was rushed to a hospital.

Tragically, he was pronounced dead at 6:23 p.m.

University officials say they go through a serious and thorough series of health tests, which gave them no indication that Coger was suffering from any health ailments.

On Friday afternoon, the Oklahoma State Medical Examiner’s Office announced that Coger died from cardiomegaly with left ventricular hypertrophy.

His manner of death was deemed natural.

Cardiomegaly means that Coger suffered from an enlarged heart, and left ventricular hypertrophy means he also had an enlarged left ventricle.