Bill Cosby talks leaves the Allegheny County Courthouse on May 24.
"I just want to wish all of the fathers a happy Father's Day", Cosby said.
Legal experts had always warned that the "he said, she said" nature of the case was always going to be hard to prove in court, not least because it happened so long ago and due to a lack of physical evidence.
Steele says he's disappointed the jury was unable to reach a unanimous decision. Judy Huth, who says Cosby sexually assaulted her at the Playboy Mansion when she was 15, sued in December 2014.
A spokeswoman then read a prepared statement from Cosby's wife Camille, who has steadfastly stood by her husband over the years, even after the accusations against him piled up. Constand did not appear at the news conference. But the judge sent them back to try to reach a unanimous verdict.
Victims' rights groups had looked to the Cosby case as a milestone in a climate in which sexual violence by powerful men has historically gone unpunished.
Camile called Steele "heinously and exploitatively ambitious" and "unethical". Given the manner in which she was dismissed by the previous district attorney, she had no option but to file a civil suit.
Constand is the only one of Cosby's accusers to have her day in criminal court.
Cosby's trial, which lasted for about a week with a second week of deliberations, included 13 witnesses, including Constand - who was grilled for seven hours.
Cosby is accused of drugging and sexually assaulting Constand in his suburban Philadelphia home in 2004.
Cosby's starring role as beloved dad Heathcliff Huxtable in "The Cosby Show" made him a household name, bolstering a reputation built on years of family-friendly standup comedy routines.
O'Neill reminded Cosby, 79, that the three counts of aggravated indecent assault remain intact and that he will remain free on 10 percent of $1 million bail, pending the retrial, which some hinted may occur within 120 days. At this time, the Pennsylvania case is the only one to result in criminal charges against Cosby.
Jury questions posed during Bill Cosby's sex assault trial.
Constand's attorneys released a statement following the mistrial, thanking both the jury and the prosecutors in the case. "The jurors, they used their power to speak". On Friday, they asked the judge for the definition the words. Judge Steven O'Neill told the jury he could not provide additional information. "We're here because of them", he said, shouting and pointing at the back of the courtroom, where other accusers were sitting.
Jurors began deliberating late on Monday (June 12), as Vulture reports.