The label means Cosby, 81, must undergo counselling for life and appear on the sex offenders' registry.
While District Attorney Kevin Steele said that Cosby deserved the maximum sentence of five to 10 years in state prison, defense attorney Joseph P. Green Jr. argued for a sentence that did not include incarceration, saying that to imprison the 81-year-old Cosby would be an "excessive hardship".
In the letter, Constand said she couldn't talk, eat, sleep or socialize after Cosby assaulted her back in 2004 at his home.
Bill Cosby arrives for his sentencing hearing at the Montgomery County Courthouse, Sept. 25, 2018, in Norristown, Pa.
Bill Cosby - one of the most iconic figures in modern US history, a multiplatform entertainer who revolutionized comedy in the 1960s and the television sitcom in the 1980s - will learn his fate Tuesday for drugging and molesting a woman who once saw him as a mentor.
A defense psychologist testified at Bill Cosby's sentencing Tuesday that the chances of the comedian committing another sex offense are "extraordinarily low" because he is old, blind and needs help getting around.
"Mr. Cosby is not unsafe", he said. "Now all I am asking for is justice as the court sees fit", said Constand, who submitted a much longer victim-impact statement that wasn't read in court.
After testifying for several hours at two trials, the first of which ended in a hung jury, Constand spoke in court Monday for just two minutes.
Cosby, who once had a family friendly reputation thanks to the 1980s television comedy "The Cosby Show", was convicted of drugging and sexually assaulting Andrea Constand, a former administrator at his alma mater Temple University, at his Philadelphia-area home in 2004.
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Cosby spokesperson Andrew Wyatt said the former TV star planned to remain silent when given the opportunity to address the court. The jury heard me.
On Monday, Kristen Dudley, a psychologist for the state of Pennsylvania, testified that Cosby fits the criteria for a sexually violent predator, showing signs of a mental disorder that involves an uncontrollable urge to have nonconsensual sex with young women.
Constand, who is now a massage therapist living in Canada, testified during the trial in April and in an earlier trial a year ago that ended with a hung jury that she had become friends with Cosby, and viewed him as a mentor.
Cosby's lawyers had fought the "sexually violent predator" designation, arguing that Pennsylvania's sex-offender law is unconstitutional and that he is no threat to the public at his age.
Bill Cosby, the comedian once revered as "America's Dad", has been deemed a sexually violent predator by the judge who will sentence him today to up to 10 years in prison.
Prosecutors are asking for five to 10 years in prison.
"The suggestion that Mr. Cosby is risky is not supported by anything other than the frenzy", Green said as demonstrators gathered outside the courthouse.
"Nobody is above the law", Steele said.
The AP does not typically identify people who say they are victims of sexual assault unless they come forward publicly, which Constand and other accusers have done. He remained a Hollywood A-lister for much of the next half-century.