Andy Griffith's death certificate says the 86-year-old actor's death earlier this week was caused by a heart attack, according to news reports.
Griffith suffered attack 24 hours before he passed away.
Andy Griffith died early Tuesday. Medical examiners also say suffered for years from other illnesses, including coronary artery disease, hypertension and hyperlipidemia.
He likely suffered from high cholesterol or high triglycerides.
Griffith's death certificate was filed Thursday with the vital records office in Dare County, N.C. He's buried in the Griffith Family Cemetery in Manteo.
Griffith was best known for playing Sheriff Andy Taylor in The Andy Griffith Show, which aired from 1960-1968, and as Matlock from 1986-1995.