Football player Tommie Gray of Cal State...

Football player Tommie Gray of Cal State Northridge died of natural causes, according to the L.A. County coroner’s office.

Gray, 21, collapsed and died of a heart attack Dec. 15 while visiting with friends in Northridge. A spokesman for the coroner’s office said Gray died of conjunctive cardiomyopathy, the result of an enlarged heart.

Gray, a 6-foot-3, 235-pound from Modesto, started at nose tackle for the Matadors.