Judge Steven O'Neill leaves the courtroom following his decision in the Bill Cosby sexual assault trial at the Montgomery County Courthouse in Norristown, Pa., Saturday, June 17, 2017.
"We can not come to a unanimous consensus on any of the counts", a note to Montgomery County Judge Steve O'Neill reads.
They've deliberated almost 40 hours since getting the case.
Still undecided, they wrapped up after 9 p.m. and will resume their work Friday morning.
Before the impasse, the sequestered jury of seven men and five women had paused deliberations six times to revisit testimony or ask for clarity on the phrasing of one of the charges. Judge Steven O'Neill gave them instructions to try again, issuing a "dynamite charge" or "Allen charge", meant to motivate an uncertain jury to reach a decision.
O'Neill, in his instruction to the jury, reminded them it is their duty to deliberate "with a view to reaching agreement, if it can be done without violence to your individual judgment". "The jury foreman has informed me that you are deadlocked", O'Neill said during court.
His attorney indicated he would like to motion for a mistrial, but the judge told him "not at this time".
"I will not set any specific time for continuation of deliberations", he said, according to the Los Angeles Times.
Cosby is charged with three counts of aggravated sexual assault.
The charges involve Cosby's sexual encounter with Andrea Constand, 44, at his suburban Philadelphia home.
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The judge's decision was echoed by Gloria Allred, Constand's lawyer, who snapped at Wyatt for pushing for mistrial.
Prosecutors say Cosby drugged and sexually assaulted Andrea Constand, the former director of operations for Temple University's women's basketball team, at his home near Philadelphia in January 2004.
As reporters streamed out of the courtroom, poet and author Jewel Allison - one of the dozens of women who have accused Cosby of assaulting them - burst into tears.
The jury deliberations have stretched across four days.
"We have really seen Mr. Cosby get the justice he was looking for in Montgomery County", Wyatt said. The charges stem from a 2004 sexual encounter with Constand. He says he believed a chat with the family from Plymouth Meeting would brighten Cosby's spirits. And District Attorney Kevin Steele on Sunday denied a media report that Cosby had ever been offered a plea deal.
The 79-year-old Cosby is facing three felony indecent assault charges that could put him in prison for the rest of his life.
Cosby used his power and fame to violate Constand, an employee of Temple University's basketball program, prosecutors argued during the trial.
Under Pennsylvania law, a judge has the power to decide what to do once a jury announces deadlock.
Constand was the prosecution's key witness, telling jurors that Cosby gave her three unidentified pills before taking advantage when she was disoriented to sexually assault her.
In that case, Cosby would not be found guilty, nor would he be acquitted.
"In most criminal cases, anything short of a conviction is a win for the defense", said Rudovsky, who isn't involved in the case.
He did not take the stand in his sexual assault trial.