Comedian Bill Cosby arrives at the Montgomery County courthouse for a trial hearings in the sexual assault case against him in Norristown, Pennsylvania on November 2, 2016. / AFP / KENA BETANCUR        (Photo credit should read KENA BETANCUR/AFP/Getty Images)
KENA BETANCUR/AFP/Getty Images
Comedian Bill Cosby arrives at the Montgomery County courthouse for a trial hearings in the sexual assault case against him in Norristown, Pennsylvania on November 2, 2016. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
Now playing
03:41
Smerconish: What Bill Cosby revealed to me
Pennsylvania Dept. of Corrections
Now playing
00:45
This is where Bill Cosby is going to prison
Bill Cosby is taken away in handcuffs after he was sentenced to three-to 10-years for felony sexual assault on Tuesday, Sept. 25, 2018, in Norristown, Pa.  (Mark Makela/Pool Photo via AP)
Mark Makela/Pool/AP
Bill Cosby is taken away in handcuffs after he was sentenced to three-to 10-years for felony sexual assault on Tuesday, Sept. 25, 2018, in Norristown, Pa. (Mark Makela/Pool Photo via AP)
Now playing
01:12
See Bill Cosby leave court in handcuffs
NORRISTOWN, PA - SEPTEMBER 24: Actor and comedian Bill Cosby returns to the courtroom after a break with his spokesman Andrew Wyatt at the Montgomery County Courthouse, during his sexual assault trial sentencing in Norristown, Pennsylvania, U.S. September 24, 2018. (Photo by David Maialetti/Pool/Getty Images)
David Maialetti/Pool/Getty Images
NORRISTOWN, PA - SEPTEMBER 24: Actor and comedian Bill Cosby returns to the courtroom after a break with his spokesman Andrew Wyatt at the Montgomery County Courthouse, during his sexual assault trial sentencing in Norristown, Pennsylvania, U.S. September 24, 2018. (Photo by David Maialetti/Pool/Getty Images)
Now playing
00:48
Cosby sentenced to 3 to 10 years
Attorney Gloria Allred speaks about the sentencing of comedian Bill Cosby on 9/25.
WPVI
Attorney Gloria Allred speaks about the sentencing of comedian Bill Cosby on 9/25.
Now playing
00:59
Allred: Judgment day has come for Cosby
Montgomery County District Attorney Kevin Steele speaks after Bill Cosby sentencing.
WPVI
Montgomery County District Attorney Kevin Steele speaks after Bill Cosby sentencing.
Now playing
00:59
Prosecutor: Andrea Constand never waivered
Now playing
00:56
Cosby accuser gets emotional after sentencing
CNN
Now playing
02:06
Accuser: I saw violence in Bill Cosby
Actor and comedian Bill Cosby (C) comes out of the Courthouse after the verdict in the retrial of his sexual assault case at the Montgomery County Courthouse in Norristown, Pennsylvania on April 26, 2018. - Disgraced television icon Bill Cosby was convicted Thursday of sexual assault by a US jury -- losing a years-long legal battle that was made tougher at retrial as the first celebrity trial of the #MeToo era. (Photo by Dominick Reuter / AFP)        (Photo credit should read DOMINICK REUTER/AFP/Getty Images)
DOMINICK REUTER/AFP/Getty Images
Actor and comedian Bill Cosby (C) comes out of the Courthouse after the verdict in the retrial of his sexual assault case at the Montgomery County Courthouse in Norristown, Pennsylvania on April 26, 2018. - Disgraced television icon Bill Cosby was convicted Thursday of sexual assault by a US jury -- losing a years-long legal battle that was made tougher at retrial as the first celebrity trial of the #MeToo era. (Photo by Dominick Reuter / AFP) (Photo credit should read DOMINICK REUTER/AFP/Getty Images)
Now playing
01:50
Bill Cosby faces up to 30 years for assault
US comedian Bill Cosby leaves December 30, 2015 the Court House in Elkins Park, Pennsylvania after arraignment on charges of aggravated indecent assault. Cosby was arraigned over an incident that took place in 2004 -- the first criminal charge filed against the actor after dozens of women claimed abuse.AFP PHOTO/KENA BETANCUR / AFP / KENA BETANCUR        (Photo credit should read KENA BETANCUR/AFP/Getty Images)
KENA BETANCUR/AFP/AFP/Getty Images
US comedian Bill Cosby leaves December 30, 2015 the Court House in Elkins Park, Pennsylvania after arraignment on charges of aggravated indecent assault. Cosby was arraigned over an incident that took place in 2004 -- the first criminal charge filed against the actor after dozens of women claimed abuse.AFP PHOTO/KENA BETANCUR / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
Now playing
04:04
Cosby accuser: I'd like him to own up ...
NBC/"Dateline"
Now playing
01:05
Accuser: I forgave Bill Cosby to find peace
cosby juror
ABC
cosby juror
Now playing
01:09
Juror on what sealed Cosby's fate
Bill Cosby departs after a pretrial hearing in his sexual assault case at the Montgomery County Courthouse in Norristown, Pa., Tuesday, Aug. 22, 2017. Cosby's retrial will be delayed as his new legal team gets up to speed on the case. (AP Photo/Matt Rourke)
Matt Rourke/AP/FILE
Bill Cosby departs after a pretrial hearing in his sexual assault case at the Montgomery County Courthouse in Norristown, Pa., Tuesday, Aug. 22, 2017. Cosby's retrial will be delayed as his new legal team gets up to speed on the case. (AP Photo/Matt Rourke)
Now playing
02:13
Bill Cosby found guilty of sexual assault
Bill Cosby arrives for his sexual assault trial, Wednesday, April 25, 2018, at the Montgomery County Courthouse in Norristown, Pa. (AP Photo/Matt Slocum)
Matt Slocum/AP
Bill Cosby arrives for his sexual assault trial, Wednesday, April 25, 2018, at the Montgomery County Courthouse in Norristown, Pa. (AP Photo/Matt Slocum)
Now playing
02:40
Cosby had an emotional outburst in court
cosby verdict emotion
cosby verdict emotion
Now playing
01:31
Watch Cosby accusers react to verdict
Getty Images
Now playing
01:38
Highs and lows of Cosby's career

Story highlights

Jurors in Bill Cosby's trial say they cannot reach a unanimous verdict

A hung jury can lead to a mistrial, but for now judge has told the jury to continue deliberations

CNN —  

After four days of deliberating, jurors in Bill Cosby’s trial said they are deadlocked and cannot come to a unanimous decision on any of the three charges against the comedian.

So now what?

Judge orders them to try again

First, Judge Steven O’Neill sent them back into deliberations in another attempt to reach a verdict, which must be unanimous. Cosby, 79, has pleaded not guilty to three charges of aggravated indecent assault.

In court Thursday, O’Neill read to jurors what is commonly known as the Allen Charge, or the “dynamite charge,” which is a set of instructions that asks jurors to re-examine their own views and opinions in order to reach a decision. It’s called the Spencer Charge in Pennsylvania, according to Jim Koval, director of communications for the Pennsylvania Courts.

“I am required to read you an instruction. The jury foreman has informed me that you are deadlocked,” O’Neill said. “If you are still deadlocked you should report that to me. If you’ve reached a unanimous decision on some of the charges, please report that back to me.”

There is no rule on how many times O’Neill can order jurors back to work under the Spencer Charge.

The jury could come back with a verdict

After further deliberations, jurors could still return a unanimous verdict. There are three possibilities:

– Guilty on all counts.

– Not guilty on all counts.

– Mixed verdict, finding guilty on some charges but not guilty on others.

Jurors can also return a partial verdict, in which they come to a unanimous verdict on some counts yet deadlock on other counts.

The three charges accuse Cosby of assaulting Andrea Constand without her consent, assaulting her when she was unconscious and assaulting her using drugs to substantially impair her ability to consent. If found guilty, he could face up to 10 years in prison for each charge.

The 12-person jury is made up of six white men, four white women, one black man and one black woman. They were bused in from Allegheny County near Pittsburgh and have been sequestered in a hotel for the trial.

Mistrial could be declared

If the jury tries again and is still deadlocked, it would be considered a “hung jury” and opens up the possibility that O’Neill will declare a mistrial.

In that case, Cosby would not be found guilty, nor would he be acquitted. After the declaration of a mistrial, prosecutors may choose to retry the case with a different set of jurors, or they may cut their losses.

Prosecutors say Cosby drugged and sexually assaulted Constand, a former Temple University employee, at his Pennsylvania home in January 2004. The case has little forensic evidence, and legal experts have said it fits the “he said-she said” dynamic that is common to sexual offense cases.

The trial began on June 5, and the jury began deliberating Monday evening. After 31 hours of deliberations, jurors said they were deadlocked.

CNN’s Jean Casarez and Laura Dolan contributed to this report.