( CNN ) As Bill Cosby faces a slew of sexual assault allegations , two women are joining a defamation lawsuit against him . Linda Traitz told CNN that she and fellow accuser Therese Serignese are joining the suit , which was originally filed by Tamara Green . Traitz , Serignese and Green are three of at least 23 women who have accused the comedian of sexual misconduct ranging from groping to rape . And after each came forward with the allegations , they were called liars by representatives for Cosby , the defamation suits says . Cosby 's attorney , Martin Singer , has called the spate of sexual assault accusations against the comedian `` ridiculous . '' He told CNN it defies common sense that `` so many people would have said nothing , done nothing , and made no reports to law enforcement or asserted civil claims if they thought they had been assaulted over a span of so many years . '' CNN was unable to reach Singer for comment about the latest development . Here are the claims of the three women in the suit : . Linda Joy Traitz . Traitz said Cosby pushed himself on her when she worked as a waitress at a restaurant in Los Angeles that Cosby co-owned when she met him in 1969 . Traitz was either 18 or 19 at the time , she said ; she did not recall exactly . But she was fresh out of high school and new to the city , she said . Cosby offered her a ride home but on the way , told her he 'd like to swing by the beach with her in his Rolls Royce , she said . They parked , and he offered her drugs , an array of brightly colored pills , `` to relax , '' she alleged . She said no , a few times . `` He kept offering me the pills , '' she alleged . She claimed that he then groped her chest , pushing her down in the seat and toward the door , and tried to lie on top of her . Singer , Cosby 's attorney , has said her account was not true . `` Ms. Traitz is the latest example of people coming out of the woodwork with fabricated or unsubstantiated stories about my client , '' Singer has said . Numerous arrests speckle Traitz 's rap sheet , including on suspicion of theft , battery and types of deception -- fraud and impersonation -- often in connection with drug possession . But Traitz spoke openly about her record to CNN , including her last arrest in 2008 , which led to more than three years in prison for drug trafficking and possession . `` When I got sent to prison ... it saved my life , '' Traitz said . `` It was a great experience for me . '' She said it ended her addiction to pain pills , and she 's been clean ever since . Therese Serignese . Florida nurse Therese Serignese , 57 , told ABC 's 20/20 that she was a 19-year-old model visiting Las Vegas when Cosby told her to take some pills in a private dressing room following a performance . After taking the pills , she remembered `` feeling drugged , and I was kind of leaning forward , and he was behind me having sex with me . And I -- I remember it because it was not good . '' Serignese never made public accusations in the immediate aftermath . She explained her decision in an article she wrote in Friday 's New York Daily News . `` Cosby was everywhere . Everyone thought he was a great family man . I knew he was n't . I just could n't prove it with anything but my word . There was no video camera or DNA evidence . No one else had accused him publicly yet , '' Serignese wrote . Serignese says she wanted to testify in support of Andrea Constand , who filed a civil lawsuit against Cosby . `` When the first victim came forward in 2005 , I was angry that he called her a liar . I wanted to back her up . But even then I worried about the repercussions . I had younger children then , '' Serignese wrote . `` Ten years ago , the climate still was n't right , '' she said . `` We would have all been humiliated . Now , I could see it was time , and I would be safer . I would n't be alone . It took me 38 years to feel safe . Tamara Green . According to her lawsuit , Green was an aspiring model in 1970 who met Cosby through a mutual friend . The two met for lunch , even though Green was feeling ill , the document states . Cosby allegedly gave Green some pills , saying they were cold medicine -- but Green started feeling `` weak , dizzy and woozy . '' Cosby took her to her apartment and started `` groping me and kissing me and touching me and handling me and you know , taking off my clothes , '' Green told NBC 's `` Today '' show . Cosby allegedly left two $ 100 bills on her coffee table and left , the lawsuit says . CNN 's Eliott C. McLaughlin and Ben Brumfield contributed to this report .
Three women are suing Cosby for defamation . They say his representatives called them in after they accused him of sexual misconduct . At least 23 women have accused Cosby of offenses ranging from groping to rape .