COVINA, Calif. (AP) – A California coroner says a man who dressed as Santa Claus and murdered his ex-wife and eight of her family members at a party Christmas Eve used cocaine before the rampage.

An autopsy report detailed Friday in the Pasadena Star-News says Bruce Pardo had low levels of the drug in his blood and urine.

Laboratory director Joe Motto says it’s unclear how much influence the cocaine had on Pardo’s behavior, but that it’s unlikely it prompted the attacks.

He says Pardo could have taken cocaine up to 12 hours before the attack.

Authorities have said the 45-year-old Pardo may have been bitter over his divorce when he went on his murder spree in the Los Angeles suburb of Covina.