Rock-'n'-roll pioneer Ike Turner's death last month at age 76 was caused by a cocaine overdose, the San Diego County Medical Examiner's office said Wednesday.

"We are listing that he abused cocaine, and that's what resulted in the cocaine toxicity," said Paul Parker, chief investigator at the medical examiner's office.

The findings were first reported by the North County Times.

Click here for photos of Turner.

The medical examiner's office also listed hypertensive cardiovascular disease and pulmonary emphysema as "significant and contributing factors" to Turner's death, Parker said.

Turner, whose musical accomplishments were overshadowed by his image as the man who brutally abused former wife Tina Turner, died Dec. 12 after years of drug abuse. He was jailed in 1989 and served 17 months.

Turner once told The Associated Press he originally began using drugs to stay awake and handle the rigors of nonstop touring during his glory years.