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8 year old Mr Cosby is accused of drugging and molesting a former Temple University employee in his home outside of Philadelphia in 2004.
The case was opened last year after dozens of women came forward with similar accusations. The c-harge is a single count of indecent aggravated assault. He has maintained that all of the encounters were consensual. Police will read a statement f-rom the accuser, Andrea Constand, who now lives in Toronto.
More than 40 women have accused Mr Cosby of sexual assault, but in nearly all of the cases, too much time has elapsed for c-harges to be pursued. The Constand case is the only one that falls within the statue of limitations for c-harges. Mr Cosby is best known for his role as the father in the television hit The Cosby Show which ran f-rom 1984 to 1992 and was a huge hit in the US and around the globe. It made the comedian one of America's most popular entertainers.
Andrea Constand says she was assaulted by Mr Cosby in 2004
The 78-year-old comedian, once the highest paid US television star, could go to prison for 10 years if convicted.
Ms Constand has said that she came to think of Mr Cosby as a "mentor and a friend" before she said he made unwanted sexual advances.
She went to visit him at his home in 2004 whe-re she said he drugged and sexually assaulted her.
A criminal complaint unsealed last year details the encounter.
Prosecutors allege that the victim protested when Mr Cosby offered her a glass of wine, saying she had not eaten that day.
He urged her to drink wine anyway, Ms Constand said in her testimony, so she drank a few sips along with the pills.
Within 30 minutes, she says she experienced blurred vision and had trouble speaking. Mr Cosby then told her to lie down on the couch and relax.
During that time she was lying on the couch, she says she was aware of Mr Cosby moving toward her, touching her breasts and genitals, and making her touch his genitals.
She says she did not consent to any of the acts, that she could not speak, and that she felt "frozen" and "paralysed".
Prosecutors re-opened her case last summer. She and Mr Cosby settled a lawsuit in 2006 and she was paid an undisclosed sum.
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