Autopsy: 'Sons of Anarchy' actor Johnny Lewis who killed landlady, fell to death not on drugs

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Johnny Lewis at the 36th Toronto International Film Festival in Toronto, Canada.

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A view of the building where actor Johnny Lewis was found dead is seen on Sept. 27, 2012 in Los Angeles.

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Actor Johnny Lewis arrives at the series premiere screening of FX Network's "Sons of Anarchy" held at the Paramount Studios theater on August 24, 2008 in Los Angeles.

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Actor Johnny Lewis attends "The Runaways" premiere during the 2010 Sundance Film Festival at Eccles Center Theatre on January 24, 2010 in Park City, Utah.

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Actor Johnny Lewis poses during the 2011 Toronto International Film Festival at the Guess Portrait Studio on September 13, 2011 in Toronto, Canada.

An autopsy report shows no drugs were detected in the body of former "Sons of Anarchy" actor Johnny Lewis, who police say killed his landlady, then fell to his death.

Toxicology results on Lewis found no traces of cocaine, alcohol, marijuana or any other types of drugs in the actor's system. Officials checked for anti-psychotic drugs as well as psychedelic drugs.

Lewis was found dead in September in the driveway of a Los Angeles residence, and police found his landlady and a cat dead inside the home. Officials believe Lewis fell while trying to flee the home after killing 81-year-old Catherine Davis.

The killing occurred just days after Lewis was released from jail. Records show he had pleaded no contest to assault with a deadly weapon and attempted burglary in separate cases.

Authorities expressed concern about his mental health in court hearings before his release.