In court documents, Swift said, "He took his hand and put it up my dress and grabbed onto my ass cheek, and no matter how much I scooted over, it was still there". "I've never been so sure of anything in my life".
Taylor Swift and her support team didn't call police after she said she had been groped by a Denver radio host during a photo session before a concert.
Mueller also sued Swift for two counts of slander, but a judge threw out those claims because the statute of limitations had passed. Swift has claimed Mueller intentionally grabbed her while posing for a picture.
In court filings, Swift said her representatives informed KYGO management about the incident but she did not demand Mueller be fired.
Taylor Swift will not be the only person testifying in the courts as she has asked some witnesses, and friends, to testify on her behalf in the trial.
Hoping the case serves as "an example to other women who may resist publicly reliving similar outrageous and humiliating acts", Swift has vowed that if she wins the case, she will donate any money she received to "charitable organisations dedicated to protecting women from similar acts of sexual assault and personal disregard". KYGO claims Mueller was sacked for violating the morality clause of his contract after it says it independently determined that he lied about the incident, changed his story and inappropriately touched Swift.
A jury trial in the civil case is set to get underway Monday in Denver.
Shamed by the public and under fire after Swift's claim, Mueller was let go from his job with 98.5 KYGO.
Ex-DJ David Mueller already has been sanctioned for destroying evidence. The case has been approved for trial despite the fact that it has been four years since the alleged sexual assault.
The DJ says as many as 20 other people could have been in the room at the time and insists the security guard present did not react to anything during the meet and greet. He and his girlfriend were escorted out of the arena and a member of Swift's team called his boss. A total of eight jurors will be picked for the trial expected to last two weeks in federal court.
"Ms. Swift knows exactly who committed the assault-it was Mueller-and she is not confused in the slightest about whether her long-term business acquaintance, Mr. Haskell, was the culprit", the documents read.
The police were not called because of Swift's wish to keep the situation "discreet and quiet and confidential", according to her attorney Douglas Baldridge. Mueller's attorney says his client may have been misidentified after someone else touched Swift.