>> reporter: the allegations date back to a 2005 civil lawsuit which claims cosby drugged and sexually assault add i woman in his home. cosby denied the accusations, but more than a dozen other women with similar stories of assault were prepared to testify against him. the case was settled before it went to trial. now, one of those witnesses is speaking out. actress barbara bowman wrote an op-ed in the "washington post" claiming cosby assaulted her multiple times after agreeing to act as her mentor. the headline read, "bill cosby raped me. why did it take 30 years for people to believe my story?" in it she said, "i'll never forget the c g of his belt as he struggled to pull his pants off." according to bowman it happened in 1985. >> hey, hey, hey, stop that! >> reporter: the height of the "cosby show's" popularity, the number one show on television. cosby has never spoken publicly about any of the allegations,