The OC coroner's office ruled that the alleged scamster took an overdose of painkillers, along with drugs used to treat depression and anxiety. Cause of death was "combined intoxication." From the WSJ:
John C. Hiserodt, a private forensic pathologist in Cypress, Calif., reviewed the toxicology report released by the coroner. He said it showed that Mr. Pang had about five times the fatal levels of both oxycodone and hydrocodone in his blood, plus the equivalent still in his stomach of about 30 oxycodone pills of 10 milligrams apiece. "You don't get this level of drug accidentally," he said. "It's pretty clearly a suicide."
Danny Pang, who died last Setepmber at the age of 42, was battling charges that he had masterminded a Ponzi-like scheme and misappropriated investor funds.