Andy Griffith: Heart attack killed the actor death certificate says

(CNN) -- Andy Griffith's death certificate says the actor died of a heart attack, after years of suffering from other illnesses, including coronary artery disease.

The North Carolina native had long endured hypertension and hyperlipidemia, his certificate said, which can suggest high cholesterol or high triglycerides.

The heart attack occurred about 24 hours before he died, the certificate says. Griffith passed away at 7 a.m. Tuesday morning and was buried less than five hours later.

He was 86.

Most known for his role as the sheriff of Mayberry on the CBS series "The Andy Griffith Show," Griffith "has been laid to rest on his beloved Roanoke Island," the family said in a statement issued Tuesday.

He was buried in the Griffith Family Cemetery in Manteo, North Carolina.