Outlining their case against Bill Cosby on Monday, a Montgomery County prosecutor said multiple people, including the comedian himself, will provide evidence that Cosby is guilty of sexual assault. But the defense said not even the alleged victims' own statements show consistent evidence of a crime.

Almost a year-and-a-half after he was charged, Cosby entered the Montgomery County Court of Common Pleas on Monday for the first day of his criminal trial, before a jury selected last week from Allegheny County. He is facing three counts of aggravated indecent assault, stemming from Andrea Constand's allegations that Cosby drugged and sexually assaulted her in his Cheltenham home in 2004. The trial is expected to last two weeks.

The first witness called to the stand was a woman who alleges that Cosby sexually assaulted her in 1996, in a sequence of events that prosecutors described as similar to Constand's interaction with Cosby. She met Cosby in 1990, when she was an assistant to Cosby's talent agent at the William Morris Agency, she testified.