One can assume from the ruling that the defense likely wanted to delve into 44-year-old Constand's sexuality, namely that she was a lesbian who somehow misled the 79-year-old entertainer. Both sides will now deliver their closing statements, and the jury could get the case as early as today.
It was the first time Camille Cosby had showed up to her famous husband's sexual-assault trial since it began last Monday in suburban Philadelphia. Unfortunately for the defense, the judge blocked the witness, citing the state of Pennsylvania's rape-shield law that precludes any mention whatsoever of an alleged victim's sexual history.
The prosecution rested its case on Friday after calling 12 witnesses to the stand.
Constand testified at length last week, with her evidence considered crucial in a case that experts say will boil down to her word against his. If convicted, Cosby could face up to 10 years in prison.
He added that Constand was always clear on the key facts: Cosby gave her unidentified pills he suggested were herbal, and then sexually abused her.
With Cosby and his wife of 50 years - who made her first appearance at the courthouse Monday - watching, the defense attorney called only one witness: a police detective to confirm the existence of a police report.
Judge Steven O'Neill asked Cosby a series of questions created to make sure he was aware of his right to testify and wasn't pressured into deciding against it. Cosby has said he is legally blind because of glaucoma.
The Bill Cosby sexual assault trial sped to a close on Day 6, with jury deliberations beginning Monday evening after the defense opted not to present a case and closing arguments concluded.
Camille Cosby has been deposed in a civil suit filed by an accuser and had been active behind the scenes in developing strategy in the criminal case, according to sources familiar with defense preparations. Lead defense attorney Brian McMonagle's final argument swung wildly from whispered portrayals of Cosby and Constand's "romantic" relationship to exasperated shouts, urging jurors that Constand's misstatements to police - including about the date of the night in question - must create doubt about Constand's accusations that Cosby committed sexual assault.More news: Keith Urban gets his day in the sun while wife watches
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The defense opens it case Monday. Cosby did not take the stand, despite suggestions from his spokesman that it was a possibility.
The case largely rests on the credibility of accuser Andrea Constand, a former professional basketball player who worked at Temple from 2002 to 2004 as director of operations for the women's team.
"Everyone always has an opinion and feels as though their opinion should matter to you", she said, adding that social media has especially made it much easier for people to do so. Constand testified that the pills left her disoriented and unable to resist him. They said that Constand's initial statements to police were full of inconsistencies that undermine the truthfulness of her story.
And he used jarring language to describe his sexual encounters with various young women and displayed hints of arrogance.
Cosby told police they had been romantic three times before.
That story parallels those of more than 60 women who accuse Cosby of doing the same thing to them; thanks to statues of limitations, however, Constand's case is the only one eligible for criminal prosecution.
"One of the greatest storytellers in the world and I'm failing", Cosby said when asked to repeat an answer in the deposition. Cosby's damning words from a deposition he gave in 2005 were read into the record.
Dozens of women have come forward to say he had drugged and assaulted them.