(CNN) An autopsy report on Las Vegas shooter Stephen Paddock said he had anti-anxiety medication in his system at the time of death, according to the Las Vegas Review-Journal.

The autopsy report from the Clark County Coroner's Office also indicated that Paddock died of a self-inflicted gunshot wound to the head, the Review-Journal said.

Stephen Paddock

According to the report, Paddock's brain remains in a research lab in Stanford University School of Medicine.

Paddock, 64, opened fire on 22,000 concertgoers from the 32nd floor of the Mandalay Bay Resort and Casino on October 1, killing 58 people and injuring almost 500.

Police broke down the door to Paddock's room and found numerous firearms and thousands of rounds of ammunition.

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