BAD AXE, MI — A jury has found a Michigan State Police trooper guilty of four criminal charges related to what investigators say was his assault of a female colleague while on duty.

Jurors on the evening of Thursday, Oct. 10, found Adam S. Mullin, 25, guilty of assault and battery, obstruction of justice, assaulting, resisting, or obstructing police causing injury, and aggravated domestic violence. During the trial, which began with jury selection on Tuesday, Huron County Circuit Judge Gerald M. Prill gave a directed not-guilty verdict for the fifth count Mullin faced, that of misconduct while in office.

The jury had begun their deliberations on Thursday afternoon.

The Michigan Attorney General’s Office prosecuted Mullin, with Assistant Attorney General Danielle Hagaman-Clark taking lead at trial.

Mullin and his fellow trooper worked together out of the Caro Michigan State Police Post, covering Huron, Tuscola, and Sanilac counties in Michigan’s Thumb region. Police reports obtained by MLive via a Freedom of Information Act request state the two had been engaging in a sexual relationship for a year, during which time Mullin would turn violent.

On Feb. 10, Mullin threatened to kill the woman and threw her several feet within an MSP Bad Axe detachment, the reports state. The woman was injured and Mullin suggested they stage a slip-and-fall during a traffic stop to conceal how she incurred her wounds, the reports state.

By the next morning, the woman was treated at a hospital in Bad Axe before being transferred to McLaren Regional Medical Center in Lapeer. Mullin had taken her to the first hospital.

The morning of Feb. 12, the female trooper’s mother brought her to the MSP Lapeer Post where she filed her complaint with detectives. She was unable to walk due to injuries and was carried into the post by a lieutenant and a sergeant, the report states.

Troopers arrested Mullin the same day.

Mullin has been a trooper since 2016 and has been on unpaid suspension since his arrest. He was married to another woman at the time of his relationship with the female trooper.

Mullin was initially free on bond with a GPS tether following his Feb. 15 arraignment. Judge Prill revoked his bond in July after finding Mullin had intimidated his victim during a preliminary examination. Mullin was accused of mouthing, “You’re dead” to her as she testified.

Mullin remains in custody. Prill is to sentence him on Dec. 2.

For more details on Mullin’s case as revealed by the reports obtained via FOIA, follow the link below.