A supervisor with the University of Oklahoma Health Sciences Center police department resigned Tuesday amid allegations he assaulted another man at a party for swingers.
Dustin John Markgraf, 38, of Oklahoma City, was charged Nov. 5 in Oklahoma County District Court with aggravated assault and battery, court records show.
Markgraf resigned from the department where he had worked as a police officer since 1997, a University of Oklahoma spokeswoman said.
He had been on administrative leave for several weeks, the spokeswoman said.
Markgraf and another man, Michael Shane Robertson, 42, of Pauls Valley, are accused of assaulting Brian Nipper, of Edmond, at a “lifestyle party” in Oklahoma City on April 29, according to a probable cause affidavit.
Nipper and his wife were among those who attended the gathering at a city hotel characterized by prosecutors as a partner-swapping party where couples had sex with other couples.
According to the affidavit, Nipper started arguing with another member of the party and was asked to leave, but refused.
Markgraf was among those who attempted to remove Nipper from the hotel and placed him in an “arm-bar” hold to subdue him.
Nipper told Oklahoma City police he was knocked to the ground and “piled on” by several people, a detective wrote in the affidavit.
“While on the ground he was hit and kicked and at one point choked,” the detective reported.
Nipper's wife said she was grabbed from behind as she and her husband were leaving the party and saw several people grab her husband and start “hitting and kicking him,” police reported.
Markgraf told Oklahoma City police investigators he “probably did hit and kick the victim,” but said he did not do so deliberately, according to the affidavit. Markgraf also said the victim “gouged” his eyes, and acknowledged telling his supervisor that his dog caused the injury.
A witness told police Robertson was seen hitting Nipper with his fist while Nipper was on the ground, the affidavit states.
Neither Nipper nor his wife could be reached for comment.
Markgraf, who was arrested Nov. 7 and released from jail the same day, declined to comment.