An autopsy on Jimmy Sullivan, the drummer for Avenged Sevenfold who was found dead on Monday, was inconclusive according to the Orange County Sheriff's office.

The coroner has ordered further toxicology, microscopic and laboratory tests in an attempt to determine how Sullivan died.

It will be several weeks before results are available.

Sullivan, known as The Rev, was found dead in the Huntington Beach, Calif., home he shared with his wife, Leana MacFadden.

He had recently undergone eye surgery but was in good health days before his death, according to his manager Larry Jacobson.

The Rev was drummer and backup vocalist for Avenged Sevenfold, a five-man band that was voted best new artist at the 2006 MTV Music Video Awards.

The band, which varied its sound from punk to metal, formed in 1999. The group's music took off in 2005 with the hit Bat Country and they have since sold 2.5 million albums, including Waking the Fallen and City of Evil.

Sullivan provided the high-speed beat behind their songs, and fellow band members remembered him as "one of the world's best drummers."

Avenged Sevenfold released a self-titled album in 2007 and was working on a fifth album at the time of Sullivan's death. -cbc.ca