LOS ANGELES — Tom Petty’s family says his death last year was due to an accidental drug overdose. His wife and daughter released the results of Petty’s autopsy via a statement Friday on his Facebook page. Dana and Adria Petty say they got the results from the coroner’s office earlier in the day that the overdose was due to a variety of medications. The statement was posted moments before the Los Angeles coroner’s office issued its official findings, which confirmed that Petty had a mix of prescription painkillers, sedatives and an antidepressant.