Mayo is asking the city for $2 million and to be reinstated as a night detective. Pacifico, Villareal and Johnson are asking for $300,000 each and to be reinstated.
In February, Phoenix Mayor Greg Stanton held a news conference saying he was "outraged" by the crime photos being show at a party.
"The video does show victims of crime, people who have either been the subjects of homicide or other tragic deaths and they're shown in an inappropriate light," Stanton said.
But the claim filed by the four Phoenix officers who are under investigation said it was "a personal slideshow the officers prepared and showed at a Dec. 17, 2011 end-of-year party at Officer Villareal's residence - a personal slide show shown to the officers' squad, consisting of personal photographs and references to events and discussions personal to the officers."
According to the Phoenix Police Department's policy, photos, interviews or notes collected at a crime scene should be handed over as evidence.
The investigation is ongoing.
Stay with cbs5az.com and CBS 5 News for updates on this developing story.
Copyright 2012 CBS 5 (Meredith Corporation). All rights reserved.
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