Bill Cosby arrives for his sexual assault trial at the Montgomery County Courthouse in Norristown, Pa., Saturday, June 17, 2017.
Constand says the star drugged and molested her in 2004 at his home outside of Philadelphia.
The 79-year-old comedian faced three charges of aggravated indecent assault linked to the alleged drugging and molestation of a university employee in 2004.
Montgomery County District Attorney Kevin Steele said they'd retry the case. He remains free on bail until the next trial is scheduled.
Although almost 60 women have publicly accused Cosby of sexual assault - charges his legal team has vehemently denied - Constand's allegations are the only to have led to criminal charges. Judge Steven O'Neill told them to return to their deliberations where they "must agree unanimously" on a verdict. How do I describe the counsels for the accusers? Breitbart posted a video of Wyatt after the mistrial was granted and he wasted no time in taking a shot at Gloria, whom he accused of conspiring against Cosby with other lawyers.More news: Sphero's New Spider-Man Toy Talks, Offers Interactive Adventures
Prosecutors in Bill Cosby's sexual assault case are praising the accuser and say she's "entitled to a verdict in this case". A retrial must take place within a year, but O'Neill said he wanted it to happen within 120 days.
In a statement issued jointly with her lawyers on Saturday, Constand thanked prosecutors and police who worked on her case. She also attacked the judge, the accuser's lawyers and the media.
The mistrial was a blow to the dozens of women who have said they were sexually assaulted by Cosby, including several who attended the trial wearing buttons that read "We Stand in Truth".
"I've been there as her support person and an advocate for assault survivors all around the country", Philadelphia trauma therapist Shari Botwin told The Wrap.
Dozens of women have come forward to say he had drugged and assaulted them.More news: Wife: Man who shot congressman wanted to work on tax policy
The mistrial declared Saturday underscored a wider struggle to reconcile the disconnect between prosecutors' depiction of Cosby as a sexual predator and his long run as one of our most beloved entertainers.
The complainant, Andrea Constand, is a Canadian and the former director of operations of the women's basketball team at Temple University. The charges against Cosby remain in place.
"The defamation case is this clever way of saying, If I say you raped me and you say it didn't happen, then you're defaming me by calling me a liar", he said. "Heinously and exploitively ambitious", Camille Cosby wrote in the statement.
But the trial has irrevocably damaged his legacy as a towering figure in United States popular culture, once adored for his seminal role as a lovable father and obstetrician on hit TV series "The Cosby Show".
Though even if that is technically true, seemingly no academics or celebrities who've talked about the case have ventured to suggest that the two won't be forever linked, or that it won't be up to future generations to process Cosby's impact on the culture for themselves, with all the information that comes with it.More news: Rocky and Karate Kid director John Avildsen dies
Constand alleges she then became incapacitated and was led to a couch, where Cosby is alleged to have fondled her breasts, put his hands inside her trousers, and penetrated her vagina with his fingers.