LOS ANGELES -- A former "Sons of Anarchy" actor who was the lonesuspect in the killing of his landlady did not have drugs in his systemwhen he died, according to an autopsy report released Thursday.

Authoritieshad been interested in whether Johnny Lewis was on drugs or medicationwhen he apparently killed Catherine Davis in her home and then fell tohis death in her driveway.

Lewis had recently been released fromjail and had a string of drug-related arrests before the killing. Hisattorney had speculated he might have been in a drug-induced psychosiswhen he killed Davis.

Toxicology results on Johnny Lewis found notraces of cocaine, alcohol, marijuana or any other types of drugs in theactor's system. Officials checked for anti-psychotic drugs as well aspsychedelic drugs.

An autopsy report noted that Lewis had nailmarks on both sides of his neck when he died and had suffered partialstrangulation. His death was ruled accidental because there was noevidence he attempted to kill himself or had been pushed.

Policebelieve Lewis fell while trying to flee the home after killing Davis,81, who operated a retreat for writers and actors out of her home.

Lewis had played Kip "Half-Sack" Epps on the TV drama "Sons of Anarchy" in 2008 and 2009 before his character was killed off.

Hehad been arrested three times during the past year. Probation officialsearlier this year expressed concern about Lewis' mental health and hisdanger to others.

A probation officer who evaluated Lewis' caseafter he attempted to break into the home of a woman wrote that he wasbeing "very concerned for the well-being of not only the community butthat of the defendant."

The report added Lewis suffered from some form of chemical dependency and mental health issue, and was a transient.

"Given this, (Lewis) will continue to be a threat to any community he may reside," it said

The break-in attempt came about six weeks after the actor hit two men over the head with a bottle during a fight.

Lewis'attorney, Jonathan Mandel, said after his client's death that drugs mayhave been a factor in the deaths. He said he recommended treatment forLewis but he declined it.