The autopsy is done, but authorities declined Friday to reveal what killed Bobby Ray Rainwater, who was found dead early Thursday outside his mobile home park residence.
Investigators are but have released few details.
Dan Salcedo, a homicide investigator with the Orange County Sheriff's Department, said a witness reported seeing a man run away from the mobile home park after the killing.
However, deputies have no suspects or persons of interest, and the motive also remains unclear, Salcedo said.
Salcedo said investigators think the killing was an "isolated incident," and that San Juan residents should not be concerned.
He confirmed that Rainwater was a registered sex offender, but said he had "no idea" if that was a factor in the killing. Rainwater lived in the San Juan Mobile Estates park with his elderly parents.
Anyone with information is encouraged to call the sheriff's department at 714-628-7170.