Ms. Constand, a former Temple University employee, says she too was drugged and assaulted by Mr. Cosby at his home near here in 2004. Prosecutors have introduced the accounts of the other women because they say they demonstrate Mr. Cosby’s signature pattern of predatory behavior.
But Mr. Cosby has denied any inappropriate behavior and said the sex with Ms. Constand was consensual. His first trial in the case, last summer, ended with a hung jury.
His defense team made a sustained effort to shake Ms. Dickinson’s credibility, pushing her to acknowledge that a memoir she published in 2002 had no mention of an assault. Reading from the book as he stood in the courtroom, Thomas A. Mesereau Jr., one of Mr. Cosby’s lawyers, said that Ms. Dickinson wrote she had never entered Mr. Cosby’s room and ended up taking two quaaludes in her own room, alone.
“You told a tale to the jury today that is completely different from the book,” he said. “You made things up to get a paycheck about Bill Cosby.”
But Ms. Dickinson said she had been advised by her publishers to leave out the assault for legal reasons.
“You take poetic license in what you do,” she said. “Today I am on a sworn bible.”
Four other women have told the jury of being drugged and assaulted by Mr. Cosby.
Ms. Dickinson, now 63, a reality TV celebrity, said she was working as a model in New York in 1982 when Mr. Cosby approached her through her agency and invited her to his Manhattan house to talk about acting.
Soon afterward, she said Mr. Cosby flew her to Lake Tahoe to watch him perform, have dinner and discuss her career. She said she went to his hotel room to continue their conversation, and there she snapped some pictures — which were shown to the courtroom — of Mr. Cosby in a colored bathrobe and cap talking on the telephone.
Ms. Dickinson said that because she was knocked out by the drugs, she does not fully remember the sexual assault. But when she woke up, she said, she found herself back in her own room, alone. “I noticed semen between my legs and I felt anal pain,” she said. “I felt very, very sore.”
The publisher of Ms. Dickinson’s memoir, Judith Regan, has confirmed there were discussions about putting the rape charge in the book.
The defense has suggested that Mr. Cosby’s accusers are motivated by media attention and even money. On Thursday, the team carried the argument to the steps of the courthouse, where Mr. Cosby’s publicist, Andrew Wyatt, accused Gloria Allred, the civil rights attorney who is representing three of the five accusers, of being “part of the con.” Ms. Allred, and her daughter, Lisa Bloom, represent Ms. Dickinson.
At one point, Mr. Wyatt asked Ms. Allred to explain her proposal to have Mr. Cosby set up a fund to compensate the women who have accused him of abuse.
“I’m so glad you asked that,” she shot back, “but you need to listen, and don’t interrupt.”
“I’m not your child,” Mr. Wyatt responded, and walked off.
Ms. Dickinson is one of about a dozen women who have outstanding civil suits against the entertainer, most of which are on hold pending the outcome of this criminal trial. Ms. Dickinson, like most of the other women, is suing him for defamation because she says his representatives characterized her as a liar when she came forward.
Lawyers from the civil cases, like Ms. Allred, are in court watching the proceedings in the criminal trial, which could affect their own.
“The outcome of the criminal trial is not directly proof at the civil trial but the developments in the criminal trial can have collateral benefits,” said Dennis McAndrews, a Pennsylvania lawyer.
In the criminal case, Mr. Cosby’s lawyers have tried to show to the jury that there were holes in each of the women’s accounts. Mr. Mesereau confronted one accuser, Janice Baker-Kinney, on Thursday morning about what he described as discrepancies between the accounts she had given her sister and later to the police and media.
Ms. Baker-Kinney had told the jury on Wednesday that she was drugged and sexually assaulted by Mr. Cosby at a house party in Reno in 1982 after he’d given her two pills. She was 24 at the time and working as a bartender.
“Is it true that you told your sister,” Mr. Mesereau asked, “you went there and drank too much and didn’t mention the pill?”
Ms. Baker-Finney said she could not recall what she had told her sister.
But prosecutors called a friend of Ms. Baker-Kinney, Mary Chokron, who testified that her friend had called her soon after the encounter with Mr. Cosby and told her that she had been knocked unconscious by some kind of party drug. “She blamed herself for taking the pill,” Ms. Chokron said.
Ms. Baker-Finney, a sports broadcast stage manager who now lives near San Francisco, said she did not speak out at the time because she feared she would be blamed for having put herself in that position and would be fired.
“That was the culture then,” she said, “and was for a very long time.”
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