Cosby was the first celebrity to go to trial in the #MeToo era and could be the first to go to prison — perhaps for the rest of his days — after being convicted in April of violating Temple University employee Andrea Constand at his suburban Philadelphia home in 2004.
Cosby, looking grim, walked into the courthouse on the arm of his longtime spokesman as protesters shouted at him. Constand arrived a short time later.
At the end of the potentially two-day hearing, Montgomery County Judge Steven T. O'Neill could sentence Cosby to as many as 30 years in prison or send him home on probation. The state guidelines for someone like Cosby, with no prior convictions, call for about one to four years behind bars.
Judges can't help being influenced a little by the "optics" of a case — that it, how it is going to look to the public, said Daniel Filler, dean of Drexel University's Kline School of Law.
In this instance, "the judge is going to get flak," he said. "The judge is going to get less flak if they see Bill Cosby walk out in cuffs."
Samuel Stretton, a veteran defense lawyer not connected to the case, said: "Obviously, the allegations are serious, and, except for his age and poor health, would normally warrant some jail time."
Cosby is legally blind and uses a cane, something his lawyers are certain to point out along with his achievements and philanthropy. Prosecutors hoped to call some of his other accusers to paint Cosby as a sexual predator deserving of prison.
Whatever the sentence, Cosby is likely to be deemed a sexually violent predator and will have to undergo monthly counseling the rest of his life, in prison or out. Neighbors and schools will be warned he is living nearby.
In the years since Constand first went to police in 2005, more than 60 women have accused Cosby of sexual misconduct, though none of those claims have led to criminal charges.
Two of those women, Lise-Lotte Lublin and Chelan Lasha, said Sunday at a Philadelphia news conference that they want prison for him and hope they get to make impact statements at the sentencing.
"I really think it's important that he spend some time behind bars," said Lublin, who said Cosby assaulted her in 1989 when she was 23. "At some point, he should acknowledge what he's done, and do the time for the crime."
Just a few hours before the sentencing hearing was to begin, Constand tweeted Ephesians 4:26, a Bible verse about letting go of anger: "Be wrathful, but do not sin; do not let the sun set while you are still angry; do not give the Devil an opportunity."
Cosby, who grew up in public housing in Philadelphia, became the first black actor to star in a prime-time TV show, "I Spy," in 1965. He remained a Hollywood A-lister for much of the next half-century, hitting his peak in the 1980s with the top-rated "Cosby Show" as the warm, wisecracking dad, Dr. Cliff Huxtable.
But behind the scenes, according to testimony, the married star sought out sexual encounters with young women, including actresses he offered to mentor, models seeking a part on his shows, and flight attendants he met in his travels. He also acknowledged obtaining quaaludes in the 1970s to give to women before sex.
The Associated Press does not typically identify people who say they are victims of sexual assault unless they come forward publicly, which Lublin, Lasha and Constand have done.