The anonymous woman alleges Cosby invited her back to his home after meeting her at a local restaurant and gave her pills that made her dizzy after she complained of stress and tension.
She admits her memory about what happened next on the night last January is fuzzy but she recalls Cosby allegedly touching her breast and placing her hand on his genitals.
In a complaint made to Toronto Police, which has been passed to Philadelphia authorities to investigate, the woman claims she awoke at about 4 a.m. the following morning with her clothing in disarray and her bra undone.
Cosby's accuser states she didn't report the incident immediately because she was concerned it might effect her standing at Temple University, Philadelphia, where she worked.
Cosby has not been charged and his attorney Jack Schmitt insists his client is innocent: "The charges are categorically false."
Meanwhile, Cosby cancelled a show in Cleveland, Ohio, on Wednesday night for "undisclosed personal reasons".
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