Ex-DJ David Mueller already has been sanctioned for destroying evidence. In 2015, Mueller sued Swift for making false accusations about groping her butt during a meet-and-greet in 2013 that resulted in his termination.
Mueller was sacked two days after the meet-and-greet with Swift.
Mueller has maintained that he never inappropriately touched Swift and in the original lawsuit claims that following the photo, a co-worker, Eddie Haskell, "excitedly told him about his experience meeting Ms.Swift earlier that night", including how he "described and demonstrated how he had put his arms around her, hands on her bottom".
Entertainment news outlet TMZ obtained and published the photo, which has since been sealed by the court.
According to pre-trial legal documents obtained by CNN, Mueller launched a law suit in 2015 claiming Swift and her co-defendents (including her mother), falsely accused him of improperly touching the star, and is now seeking £2.3 million in damages. Swift's attorney Douglas Baldridge was also present.
At the time of the alleged incident, Mueller was a radio DJ for country music station 98.5 KYGO in Denver on the Ryno and Jackson morning show, going by "Jackson".
Swift and her mother will personally testify at Denver hearing.
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The trial is expected to last about two weeks.
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".
According to the Denver Post, radio host Mueller was invited to a meet-and-greet with Swift during the Denver stop of her Red tour. The singer is aware of the impact and influence she has on other victims of sexual assault, especially in a day and age where discussions of inappropriate behavior by public figures are more prevalent.
Jurors deciding whether a radio host groped Taylor Swift during a photo op - and whether she and her team got him fired - will have to determine not just whose story to believe but what to make of a photograph that both sides say proves their case.
Swift's security guard was about 3 feet (about 1 meter) away during the meet-and-greet, Mueller says.
Swift is countersuing, claiming sexual assault.
Mueller denied the allegation and said he asked that they call the police.