Bill Cosby seeks to get sexual assault conviction thrown out in court due to 'agreement' made 10 years ago

The comedian’s defence lawyers will argue the charge of sexual assault should be dropped due to an agreement he supposedly made a decade ago with a former district attorney

The 'agreement' Mr Cosby made with a district attorney 10 years ago was never put in writing (Twitter)

Disgraced comedian Bill Cosby will ask in court on Tuesday for his conviction of sexual assault to be dropped due to a supposed agreement he made 10 years ago with the former District Attorney of Montgomery County.

Mr Cosby was charged on 30 December 2015 with one count of aggravated indecent assault against Andrea Constand. He allegedly invited Ms Constand to his Pennsylvania home to discuss her professional career in 2005, drugged her and sexually assaulted her.

Ms Constand is one woman in a long line of people who have since come forward and made similar accusations against Mr Cosby.

The comedian’s lawyers plan to argue to the Administrative Judge Steven O’Neill on Tuesday that the district attorney at the time, Bruce Castor, “promised” Mr Cosby he would never be prosecuted based on the deposition testimony from a civil case filed by Ms Constand in 2005, as reported by CNN.

Mr Castor did not file sexual assault charges against Mr Cosby in 2005, citing a lack of “credible” evidence.

The case was settled confidentially but Mr Cosby did answer questions under oath. His answers were sealed for the last decade, but were unsealed last summer by a federal judge.

Mr Cosby’s lawyers have admitted the supposed deal negotiated a decade ago was never put in writing and his former lawyer is now dead.

The case has since been re-opened by a different prosecutor using “new evidence” based on a question Ms Constand’s civil lawyer asked Mr Cosby during the sworn testimony.

“When you got the Quaaludes, was it in your mind that you were going to use these Quaaludes for young women that you wanted to have sex with?” she asked him.

He replied: “Yes”.

Mr Cosby said later he was only referring to one unnamed woman.

Mr Cosby insists that his sexual contact with Ms Constant was consensual.