Contrary to What You Might Think, Tom Petty’s Cause of Death Hasn’t Been Determined

We don’t know yet. Yes, it was reported that he was found not breathing and in full cardiac arrest, which was interpreted as a heart attack. What killed Tom Petty?  
  But as for an official cause of death, that’s been “deferred” as the LA County coroner’s department appears to be awaiting the results of an autopsy. Here’s the public document.
Contrary to What You Might Think, Tom Petty’s Cause of Death Hasn’t Been Determined