The frail, 80-year-old Cosby -- once beloved as "America's Dad" -- risks spending the rest of his life behind bars when he is sentenced for drugging and molesting Andrea Constand at his Philadelphia mansion in January 2004.
Cosby sat emotionless in the packed courtroom in Norristown, just outside Philadelphia, as the verdict was read out to stifled sobs in the gallery. Cosby's attorney immediately vowed to appeal.
T=It was a devastating downfall for the once towering figure in late 20th century American popular culture, the first black actor to grace primetime US television, who hit the big time after growing up as the son of a maid.
Now, he is a convicted sex offender staring prison in the face.
Cosby's first trial ended last June with a hung jury, hopelessly deadlocked after 52 hours of deliberations.
But on Thursday, a new sequestered panel, which deliberated for more than 14 hours over two days, found him guilty on all three counts of aggravated indecent assault.
Constand, a 45-year-old Canadian former basketball player turned massage therapist, sat with supporters in court to hear the verdict.
Each count carries a maximum penalty of 10 years in prison. Judge Steven O'Neill is expected to hand down a sentence in the next 60 to 90 days.
The pioneering African American actor and entertainer, adored by millions for his defining role on "The Cosby Show," sat in silence as the jury announced the verdict that will change his life forever.
But after the panel was led out, the Emmy winner -- dogged by allegations of similar assaults against 60 women -- erupted in an expletive-laden tirade when prosecutors argued he was a flight risk.
- Profanity from Cosby -
"He doesn't have a plane, you asshole!" yelled Cosby, referring to himself in the third person, to shocked gasps after the district attorney claimed he could flee anywhere in the world by private jet.
The verdict was a vindication for the prosecution, with the district attorney who presided over the conviction saying the real Cosby had been unmasked after he "spent decades preying on women."
"He used his wealth, he used his network of supporters to help him conceal his crimes. Now we know today who was behind that act, who the real Bill Cosby was," said the chief prosecutor, Kevin Steele, hoping the verdict would embolden other victims of sex crimes to come forward.
Other women who claimed to have been assaulted by the disgraced megastar were elated. One was so emotional, she broke down in sobs and had to be escorted out of the courtroom.
"We are so happy that finally we can say, women are believed, and not only on #MeToo, but in a court of law," said Gloria Allred, the high-profile lawyer who represents 33 Cosby accusers.
"I feel like my faith in humanity is restored," said Lili Bernard, the woman who had to be guided out of the courtroom.
The verdict ended a winning streak for Los Angeles lawyer Tom Mesereau, who leapt to fame for getting Michael Jackson acquitted of child molestation in 2005, but who ultimately failed to deliver for Cosby with a defense that hinged on his portrayal of Constand as a money-grabbing con artist.
"We are very, very disappointed," he said, vowing to appeal. "We don't think Mr. Cosby is guilty of anything and the fight is not over."
A case with no physical evidence, the trial essentially boiled down to he-said, she-said, and what the jury thought of Constand's credibility.
Experts had suggested that the #MeToo movement, which since last year has disgraced a litany of powerful men such as Harvey Weinstein and Kevin Spacey, could make jurors more inclined to believe female victims.
- 'Could not fight him off' -
Constand said she went to Cosby's home to discuss her impending resignation as director of operations for women's basketball at Temple University, where he was on the board of trustees.
The actor offered her three blue pills to "help take the edge off," which she took believing they were a natural remedy. But within minutes, she lost consciousness.
When she came to, she said Cosby was penetrating her vagina with his fingers, groping her breasts and making her masturbate him.
"I was limp and I could not fight him off," she said.
On Thursday, she beamed and hugged her attorney, but declined to speak to reporters.
When Constand first reported the assault, Montgomery County refused to press charges.
Prosecutors reopened the case in 2015, nearly a decade after she signed a $3.4 million settlement with Cosby in 2006, claiming that new evidence had come to light just as other accusers came forward.
Around 60 women, many of them onetime aspiring actresses and models, publicly branded him a calculating, serial predator who plied victims with sedatives and alcohol to bed them over four decades.
But Constand's was the only case that happened recently enough to prosecute.
Crucial to the second trial was the judge's decision to let five other accusers testify.
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