One of the judges on the case said he would like a retrial to begin within 120 days.
Cosby's team immediately went on the attack. Cosby said he never took the powerful sedative, preferring to keep it on hand for social situations.
In December 2015 - five months after 35 other women offered similar accounts of sexual assault at the hands of Bill Cosby in a NY cover story - Montgomery County prosecutors charged him with three felony counts of aggravated indecent assault. She also criticized the judge, the accuser's lawyers and the media.
Even the former district attorney in the Constand case piled on, saying he thought Cosby lied to authorities.
Over the weekend, his wife, Camille Cosby, spoke out, taking on the district attorney in a statement, calling him "heinously and explosively ambitious".
"Mr. Cosby does not intend to dignify these allegations with any comment".
David Harris, a professor at the University of Pittsburgh School of Law who specialises in criminal justice, said the hung jury did not mean that a civil jury would clear Cosby of liability. "She would have made you nearly cry", he said. Prosecutors say they will retry the case.
"We came here looking for an acquittal, but like that Rolling Stones song says, 'You don't always get what you want, sometimes you get what you need, '" defense lawyer Brian McMonagle told reporters. She accused Judge Steven T. O'Neill, who oversaw the case, of "arrogantly" siding with the prosecution. On Saturday, they came back and told O'Neill they were hopelessly deadlocked. "I feel bad for all of you, I really do".
He reminded prosecutors and the defense that "a mistrial is neither vindication nor victory for anybody".
The jury deliberated for 52 hours, which is longer than the actual trial lasted. "Bill Cosby's trial is about much more than Bill Cosby", said the comedian and writer Lena Dunham on...More news: Britain to hold special two-year parliament session to tackle Brexit
McMonagle said this year's trial was unfair.
Media outlets are urging a judge to make the names public.
He said Constand's mother was also a stellar witness. Prosecutors have suggested he might have given her quaaludes, a highly popular party drug in the 1970s that was banned in the U.S.in 1982.
Constand pursued criminal charges against Cosby in 2005 and got nowhere, not because detectives didn't believe her but because her case didn't seem winnable.
The jury deadlocked on charges that Cosby drugged and molested a woman in 2004, resulting in a mistrial for the 79-year-old TV star.
She once served on a jury where the foreperson was the lone holdout for an acquittal.
"This isn't talking to a trustee". "Why are we running from the truth of this case - this relationship?"
Wyatt had said the deadlock showed that jurors doubted Constand's story.
"There are some things in this case that should be fuzzy. Why?"
Prosecutors argued Cosby drugged and sexually assaulted Constand. "She spent a lot more time trying to forget what happened than trying to remember that night". Speaking in a calm and unemotional tone, Veronique Valliere, a psychologist, testified that sexual assault victims are frequently so traumatized that they can be confused about details.