Andy Griffith died of a heart attack

MANTEO, N.C., July 5 (UPI) -- The cause of death for television icon Andy Griffith this week in North Carolina was a heart attack, E! News said Thursday.

The star of "The Andy Griffith Show" and "Matlock" was buried on his family farm hours after he died Tuesday morning. He was 86.

E! News said his death certificate reported the actor suffered a heart attack 24 hours before he died. He had a history of coronary artery disease, hypertension and hyperlipidemia, a condition related to high cholesterol, the report said.