Prosecutor Kevin Steele announced in court that he will retry Cosby.
Constand's claim was the only one to lead to criminal charges, with numerous others dating too far back to allow for prosecution.
The entertainer had no visible reaction in court.
After a Montgomery County, Pennsylvania judge declared a mistrial in Andrea Constand's headline-making case against the once-beloved sitcom star, Allred promised that justice would be served for Constand and 60 other accusers who have come forward with accusations against the comedian. The defense tried to block the deposition from trial, but since there was no written agreement in 2005 with then D.A. Bruce Castor not to charge Cosby, he agreed to the deposition.
Bill Cosby entering court this week his case has ended in a mistrial
Women who have accused comedian Bill Cosby of sexual assault appeared optimistic Saturday despite their disappointment that a mistrial was declared in the criminal case against the comedian.
"How do I describe the district attorney?"
"I have no authority to do this", Judge Steven O'Neill said in the 52nd hour of deliberations on Friday night. Overtly and arrogantly collaborating with the District Attorney.
Though Cosby did not testify, he attended proceedings every day. But it was his reputation as a public moralist who urged young people to pull up their saggy trousers and start acting responsibly that prompted a federal judge to unseal portions of an explosive deposition he gave more than a decade ago as part of Constand's civil lawsuit against him.More news: Hundreds protest after officer acquitted in fatal shooting of Philandro Castile
From the opposing counsel, Attorney Gloria Allred clarified that a mistrial does not represent the end of the case. Cosby, 79, claims she consented to their encounter. Cosby broke barriers as the first black actor to star in a network show, "I Spy", in the 1960s and created the top-ranked "Cosby Show" two decades later, starring as kindly Dr. Cliff Huxtable.
But his live performing career stalled in 2015, as multiple accusers began going public with their stories.
At least 10 women have pending civil claims against Cosby in lawsuits filed in California and MA.
Cosby himself did not address the small crowd - and his manner was far from the jokey one he had had interacting with supporters at the courthouse over the previous two weeks, when he would often repeat the "Hey, hey, hey" greeting that had become a catchphrase in his '70s animated series "Fat Albert". McMonagle, in his closing argument, pointed out that Constand telephoned Cosby dozens of times after the alleged assault. Across the well of the courtroom, jurors stood one-by-one in the jury box and said, "Yes", as the judge asked each whether they agreed that the jury is "hopelessly deadlocked".More news: Number of Teens Vaping, Smoking Decreasing — CDC
The jury had been deliberating for more than 50 hours on whether to convict the fallen TV star, but could not agree whether he had drugged and molested the 44-year-old.
The trial drew intense media attention, with more than 100 credentials issued for print, online, television and radio reporters.
Even with the lower standard of evidence in civil cases, Rodney Smolla, dean of Delaware Law School, said that plaintiffs bringing defamation claims faced a significant legal challenge.
Under questioning from her lawyer, Cosby acknowledged that he had obtained several prescriptions for quaaludes in the 1970s for the goal of offering the powerful sedative to women he wanted to have sex with. He was charged shortly before the statute of limitation was set to expire.More news: Katy Perry makes Twitter history with 100M followers