In legal documents filed last week in Los Angeles, Richards claims her husband became obsessed with conspiracy theories surrounding the 9/11 terrorist attack and the death of O.J. Simpson's wife, Nicole.
She reveals, "Respondent's (Sheen) behavior was totally irrational. The Respondent became paranoid.
"Respondent began to obsess about vaccines being poisonous, about 911 (sic) being a conspiracy, purchasing gas masks on the Internet, and putting guns under our coffee table so that they would be within reach if someone broke into our house.
"Respondent also displayed what I can only describe as an abnormal fascination with Nicole Simpson's death and showed my mother and I her autopsy photographs, which I found very disturbing.
"I had one small child and was pregnant and I was afraid to leave him; I was also afraid to stay with him."
Richards eventually filed for divorce. The couple reconciled towards the end of last year, only to split for good in January.
The actress has now won a temporary restraining order against Sheen, claiming the actor has made threats to her life and fearing he has become a danger to their two daughters.
Sheen denies all the claims against him.
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