Andrea Constand, right, returns to the courtroom at the Montgomery County Courthouse during Bill Cosby's sexual assault trial Thursday, June 15, 2017, in Norristown, Pa. Cosby is accused of drugging and sexual.
The jury of seven men and five women have deliberated for almost 40 hours since getting the case Monday.
The judge reminded the jury that it's their duty to try to reach a decision, even on some of the charges. But the jurors failed to come to an agreement by 9 p.m. ET, after 40 hours of discussions.
They'll resume deliberations Friday morning in suburban Philadelphia. They looked more upbeat than previous nights.
The sequestered jurors have appeared increasingly exhausted and upset after deliberating late into the night the past three days.
"The record has been broken for Montgomery County, for deliberations, Wyatt said".
A hung jury would be a clear victory for Cosby, who would avoid what could have been years in prison.
Joe Molinaro says "it was very surreal" to meet "the big-time celebrity".
Andrea Constand tweeted the video Thursday.
The Cosby Show star has long maintained the sex he had with Constand, a former employee at his Temple University alma mater, at his Pennsylvania home over a decade ago was consensual. Johnson told jurors Cosby sexually assaulted her in strikingly similar fashion in 1996.
Constand accused the comedian of drugging her with three blue pills before proceeding to fondle her breasts, put his hands into her trousers, and place her hand onto his erect penis during a 2004 encounter, according to an affidavit.
Wyatt said Cosby is resting and has informed his wife, Camille, to inform her of the deadlock.
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Bill Cosby leaves the Montgomery County Courthouse during his sexual assault trial, Thursday, June 15, 2017, in Norristown, Pa. In 2014, Cosby's history of alleged sexual assault resurfaced after comedian Hannibal Buress referenced it while performing at a Philadelphia comedy show, with the clip becoming a viral hit.
She said, "I'm grateful that they are not rushing to a verdict".
Cosby knit his fingers, working his hands into a ball that he held in front of his mouth as the contents of the note were read in court by O'Neill.
She added, "They can not reach a verdict until all of them agree".
The trial began on June 5, and the jury began deliberating Monday evening.
Cosby is charged with drugging and molesting a woman in his Philadelphia-area home in 2004.
The judge also appeared angered by what he called a public misperception that there was a time limit on deliberations, which he suggested was fueled by statements from Cosby's spokesman, Andrew Wyatt, on Thursday night urging O'Neill to end the trial.
However, the counts could be merged at sentencing if he is convicted.
Trial attorney Priya Sopori, partner at Greenberg Glusker in Los Angeles and a former federal prosecutor, said that without forensic evidence to consider, the jury is likely "asking themselves questions about what it means to consent to sexual activity".
Mr Cosby said in a 2005-06 civil deposition that he provided pills to help her relax, but said it was a cold medication.
Dozens of women have come forward to say he had drugged and assaulted them. #Bill Cosby's spokesperson believes that this deadlock shows the truth of Cosby, and points to the fact that he is not guilty.
Montgomery County does not keep statistics on length of jury deliberation, the court says. Thursday morning's motion was denied by the judge. Johnson testified that she was drugged and assaulted by Cosby in 1996. He has said it was Benadryl, a cold and allergy medicine.