The jury of seven men and five women in Norristown, Pennsylvania delivered the verdict during their second day of deliberations that began late Wednesday morning, following a two-week trial.
"This man is nothing like the image he played on TV", she said during closing arguments.
After the verdict, Cosby's lawyer Tom Mesereau said "the fight is not over" and he will appeal the jury's decision.
Cosby's first criminal trial, held in the same Norristown, PA courtroom last June, ended in a mistrial. They embraced, smiled and chatted, and he gave her a peck on the cheek.
"This case is about trust, betrayal and the inability to consent", Kristen Feden told jurors, tearing into the defense's "vicious" and "filthy" character assassination attempts against Cosby's accusers. Prosecutors in Montgomery County at the time decided not to file charges in the case, and Constand and Cosby settled a civil lawsuit for $3.38 million in 2006.
They included his version of what happened the night Constand says he drugged her with three pills and molested her at his suburban Philadelphia home in January 2004, and his admission that he gave quaaludes to women he wanted to have sex with in the 1970s.
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Cosby's attorneys attacked Constand by portraying her as a liar who tried to frame him to make money. while prosecutors called out the attack as the reason sex crime victims are afraid to come forward. Cosby shouted, "He doesn't have a private plane, you a**hole!" "The perpetrator of that con is this man, sitting right here".
"This is his con, and he's laughing like it's amusing, but there's nothing amusing about stripping a woman of her decency", Feden said. Then as now, Cosby pleaded not guilty and has repeatedly denied allegations of wrongdoing.
The defense highlighted more than a dozen inconsistencies in what Constand has said over the years.
A case with no physical evidence, the trial essentially boiled down to he-said, she-said, hinging on how credible the jury found 45-year-old Constand, a former basketball player turned massage therapist. Prosecutors have noted that Cosby's travel records have large gaps in time. Cosby's defense argued that the encounter with Constand was consensual, but the actor declined to take the witness stand and testify on his own behalf. He used his iconic, transcendent TV persona, prosecutors said, to trick women into taking pills that he knew would make them unable to resist his sexual advances. This time around, the judge allowed five such women to take the stand.
He pushed Constand on why she had stayed in touch with Cosby after the incident and portrayed her as a desperate, cash-strapped pyramid scheme participant.