Describing how she became "purely platonic" friends with the comedian, Ladd claims that Cosby gave her a pill for a headache before going to see a film, saying "trust me". The rest, she says, was a blurr.
"For more than 45 years I have tried to recall exactly what happened that night," Ladd wrote. "To this day it remains a blur. I have a vague recollection of feeling like I was floating while walking through Times Square and watching some kind of Japanese samurai movie with him. I don't remember where the theater was nor very much of the evening.
Bill Cosby: Career in pictures
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"What I do recall, vividly and clearly, is waking up the next morning nude in the bed of his friend's apartment and seeing Cosby wearing a white terrycloth bathrobe and acting as if there was nothing unusual. It was obvious to me that he had had sex with me. I was horrified, embarrassed and ashamed. There was a mirror above the bed, which shocked me further."
Ladd said that she didn't report the incident at the time, as attitudes towards rape were different. "It never occurred to me to go to the police," she wrote. "It was a different time and 'date rape' was a concept that didn't exist. I just kept asking myself over and over in disbelief why this had happened to me. Other than my roommate, I did not discuss that night with anyone for 36 years."
The star of The Cosby Show has already been accused of raping numerous other women, claims that he strenuously denies through his lawyer, Marty Singer.
The Independent has contacted Cosby's lawyer and publicist for comment.
