The panel told Judge Steven T O'Neill that they were unable to reach a consensus against Cosby, who is facing three counts of aggravated indecent assault.
Art Patterson, a social psychologist with DecisionQuest, a New York-based trial consulting firm, also told The Washington Post that other factors include how strong the prosecutors think the evidence is, how high-profile the case is and how much it will cost to go through another trial.
District Attorney Kevin Steele announced a short time later that Cosby would face a re-trial in the criminal case, in which the 79-year-old is accused of drugging and sexually assaulting Constand in 2004.
Soon after the decision came down, Cosby's wife, Camille, issued a statement attacking the D.A., the judge, and the accusers.
She went on to thank counselors Brian McMonagle and Angela Agrusa, as well as Andrew Wyatt from their public relations team. Overtly arrogant and collaborating with the District Attorney.
Cosby has denied Constand's allegations of assault, saying that they engaged in a consensual sexual relationship.
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"Each of you has a duty to consult with one another and to deliberate with a view to reaching an agreement", he said, sending them back into deliberations.
Allred said she was proud of the women who testified in court, one of whom was her client Kelly Johnson.
Prosecutors plan to retry the comedian on sexual assault charges.
The jurors have re-examined both Cosby's and Constand's versions of the night in question, with particular focus on the pills that he gave her before the sexual encounter began.
Speaking to the result of the case, Allred said: "We should never underestimate the blinding power of celebrity".
The case seemed to reflect both sides of the public narrative exactly, defense arguing Cosby used his power, wealth, and authority to take advantage of younger women while prosecution painted the alleged victims as purely in it for the money.