Pang, only 42, stood accused of defrauding primarily Taiwanese investors who put $823 million into Pang's company and could stand to lose most of it.
The Securities and Exchange Commission said the company resembled a Ponzi scheme, with early investors paid returns from money put in by later investors.
Pang lived lavishly, and as much as $83 million of investor's money was funneled into everything from $38.5 million for private jets to $1.8 million for a bookmaker.
The coroner ruled out foul play after an autopsy Sunday, and is awaiting toxicology tests before determining a cause of death.
Police removed bags of evidence from Pang's home in a gated Orange County community, according to a neighbor.
Pang also faced suspicion of hiring a former lawyer to kill his first wife, former exotic dancer Janie Louise Pang, but prosecutors dropped a murder case against the alleged hit man after a mistrial.