Ike Turner's death on December 12th of last year has been ruled "a cocaine overdose," according to the San Diego County Medical Examiner's office. "We are listing that he abused cocaine, and that's what resulted in the cocaine toxicity," said Paul Parker, the office's chief investigator. Hypertensive cardiovascular disease and pulmonary emphysema are also being listed as "significant and contributing factors" to Turner's death. Turner battled emphysema throughout his final years, but didn't allow it to stop him from making music and touring. To read Rolling Stone's obituary for the legendary musician, click here.