Cosby faces three counts of aggravated indecent assault.
The criminal case against Cosby partly stems from the accuser's related lawsuit.
Cosby himself didn't comment, remaining stoic as the judge declared a mistrial, but Wyatt declared the star's "power is back".
His lawyers were triumphant, his long-silent wife savaged the prosecutors, and his publicist claimed that Bill Cosby's reputation was now "restored" after a jury failed to reach a verdict on whether he sexually assaulted a woman in 2004.
The 79-year-old Cosby is charged with drugging and assaulting Andrea Constand, a former director of operations of the Temple University women's basketball team.
Bill Cosby exits the Montgomery County Courthouse after a mistrial was declared in Norristown, Pa., Saturday, June 17, 2017.
Cosby's depositions in that case, however, were unsealed by a federal judge in 2015, revealing his admissions that he had given sedatives to young women in the 1970s.
Cosby also said he gave Constand three half-tablets of the cold and allergy medicine Benadryl to help her relax before what he insisted was a consensual sexual encounter at his home.
Philando Castile death: Fate of police officer now in jury's han
The jury is expected to begin considering the case later Monday after just five days of testimony, evidence and arguments. Castile's girlfriend Diamond Reynolds' video of the gruesome aftermath of the shooting was shared widely on Facebook.
Jurors spent more than 45 hours in sequestered deliberations since getting the case Monday, telling Judge Steven O'Neill as recently as midday Friday that they weren't making progress.
"It can never be clearer that if you speak up, you could be chilling the justice system in the future if jurors are needed in this case", Judge O'Neill told them.
O'Neill sent them back yet again - something judges have the discretion to do as many times as they see fit - but by Saturday, after six days of fruitless deliberations, the jury convinced O'Neill that they were never getting to a unanimous decision.
He reminded prosecutors and the defense that "a mistrial is neither vindication nor victory for anybody".
Former federal prosecutor David Weinstein said Cosby's celebrity nearly certainly played a role in the jury's deliberations, perhaps to convince "two or three jurors that it's impossible to convict Dr. Huxtable, to convict Fat Albert. that he couldn't have done this disgusting thing". There is also the prospect of a fresh criminal trial in his home state of Pennsylvania.
Bruce Castor, the ex-prosecutor who passed on Constand's case in 2005, said Saturday that he was disappointed but not surprised in Steele's failure to win a conviction.
The Associated Press does not typically identify people who say they are victims of sexual assault unless they grant permission, which Constand has done.
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