The juror who spoke to the AP said other jurors expressed the view in the deliberating room that "politics was involved".
A mistrial was declared Saturday in Cosby's sex assault trial near Philadelphia.
The juror told The Associated Press that the panel was nearly evenly split in its deliberations, with a similar number of jurors wanting to convict the 79-year-old entertainer as acquit him on charges he drugged and molested a woman at his Philadelphia-area home in 2004.
"Jurors shall not disclose anything said or done in the jury room by any of their fellow jurors that may disclose their thoughts or opinions", he said of the jurors, who had been bused from the Pittsburgh area to the Norristown, Pa., courtroom several hundred miles away, where they were sequestered for two weeks.
Other jurors declined to speak to NBC News.
There was one tally of 10-2, but some of those jurors switched their votes, the juror said.
Cosby accuser Lili Bernard, who was in the courtroom every day, says she is not surprised to hear reports of tension among the jurors.
The juror spoke to the AP on condition of anonymity in order to discuss the sensitive deliberations.
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One of the jurors in Bill Cosby's sexual assault trial told a reporter that the comedian had "already paid a price and suffered". One frustrated juror allegedly punched a wall.
Back in 2015, famed comedian Bill Cosby was charged with three counts of aggravated indecent assault in relation to allegations that he drugged and molested a Canadian basketball player in 2004.
ABC published the interview with the juror on Wednesday after Judge Steven O'Neill ordered the public release of the jurors' names, granting a request by a dozen media organizations, including The Associated Press and the major TV networks. Prosecutors plan to try Cosby again.
An alternate juror, who sat through all the testimony but was not involved in any of the deliberations, previously told NBC News that he would have voted to convict Cosby. Cosby said the encounter with Andrea Constand, a former Temple University employee, was consensual.
"I was shocked there was a mistrial", the juror, who did not wish to be identified, told Inside Edition.
He also talked about the tense atmosphere as jurors spent almost a week deliberating in close quarters, a room 13 feet by 16 feet.
The juror also believes that Cosby's alleged actions weren't premeditated, explaining: "I think that he gave [the pills] to her, and then later when he saw what was up, maybe he figured, 'Maybe I'll do something'". He said the panel was typically more "evenly split" and "up the middle". He said he would rule by Wednesday, June 21.
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