If sent to prison, he will be one of only a few state inmates who are older than 80 or legally blind.
Constand tweeted a Bible verse earlier Monday.
But the Buress clip was the first rumble of an avalanche bearing down on Cosby, prompting dozens of women to come forward with their own stories of abuse by the entertainer, eventually leading to his arrest and subsequent conviction.
Bill Cosby could be headed to jail as soon as Monday morning, depending on how his sentencing goes.
The stunning outburst marked a stark contrast from Cosby's relatively quiet public profile in recent years. Cosby has arrived at a Montgomery County courthouse alongside his spokespeople, Andrew Wyatt and Ebonee Benson, ahead of a 9 a.m. hearing.
Cosby, once the beloved star of the 1980s television comedy "The Cosby Show", eventually faced accusations from some 60 women stretching back decades, some of which had always been known but previously failed to gain traction.
A judge will sentence Bill Cosby on Monday for his conviction on sexual assault.
Law professor Aviva Orenstein told Reuters that #MeToo "may have influenced the judge's willingness to allow more witnesses".
As it stands, Cosby faces up to 30 years in prison.
They filed a motion this month demanding that O'Neill recuse himself from the case before sentencing, accusing him of bias because of an alleged grudge against a former prosecutor, Bruce Castor, who previously declined to prosecute Cosby and testified at a pre-trial hearing in the current case.
But prosecutors are expected to paint him as a serial and unrepentant sexual predator, who has never admitted wrongdoing.
Pennsylvania's sex-offender board has examined Cosby and recommended he be deemed a "sexually violent predator", concluding that he has a mental defect or personality disorder that makes him prone to criminal behavior.
This avoids a repeat of the trial of ex-Team USA gymnastics doctor Larry Nassar, who faced testimony from more than 100 women during his sentencing hearing.
"I do think you can draw a line between the Cosby case and where we are now", she said. "At some point, he should acknowledge what he's done, and do the time for the crime".