The death of rock icon Tom Petty became even more of a mystery after his death certificate surfaced with no official cause of death given. TMZ reports that the certificate, filed with Los Angeles County, “says Petty passed away at 8:43 PM on Oct. 2 at UCLA Santa Monica. The certificate lists the immediate cause of death as ‘deferred’ — which could mean officials are still waiting for autopsy results.”

Other details on the document include Petty’s full name, Thomas Earl Petty, that he was married to Dana Marie York and that he lived in Malibu, Calif., for 43 years.

Petty, who was inducted into the Rock and Roll Hall of Fame in 2002, died after being found unconscious and in full cardiac arrest. He was 66.

His many rock anthems include “American Girl,” “Breakdown,” “Refugee,” “Here Comes My Girl,” “I Need to Know,” “Free Fallin'” and “Don’t Come Around Here No More.”