Carlyle Calhoun, a 10-ear veteran with the Chicago Police Department, was charged with sexually assaulting a male suspect in his custody.
Prosecutors said Calhoun then grabbed the victim's genitals and took a cellphone photo of them.
Carlyle Calhoun, 46, had arrested the male victim on February 3 on a misdemeanor charge when the suspect expressed suicidal thoughts.
Court records show that when the other officer, who has not been named, returned, Calhoun escorted the man to a bathroom down a hall.
Calhoun's attorney said the officer was well-respected, helps care for his elderly mother and performed a high-pressure negotiation with a knife-wielding man a year ago, reported the Chicago Tribune.
The family of a man shot to death by a Chicago Police officer late previous year are suing the Chicago Police for alleged wrongful death.
Photos of the victim were later recovered from the officer's phone.
Calhoun was relieved of his police powers and placed on paid desk duty early last month after police learned of the allegations, Guglielmi said. While on the job in November, the respected officer also helped talk down a knife-wielding suspect and arranged the safe return of the man's daughter, attorney Tammy Wendt said.
He was ordered held on a $200,000 bond, charged with aggravated criminal sexual assault and official misconduct, reported CBS Chicago.
After the alleged assault, Calhoun told the man once back in the hospital room that he would contact him on Facebook sometime in the next six days, the Chicago Sun-Times reports. The department will move to suspend him without pay now that he has been criminally charged, he said.