Officer Dominique Heaggan-Brown was arrested Wednesday after the Milwaukee County prosecutor filed a criminal complaint, according to a statement released by the Milwaukee Police Department. The unidentified victim told police on Aug. 15 that Heaggan-Brown had sexually assaulted him while off duty, according to the statement.
The complaint was made two days after Heaggan-Brown fatally shot 23-year-old Sylville Smith, who police said was holding a gun when he was shot, after a brief chase.
The department said an investigation found "additional allegations" that led to the charges against Heaggan-Brown. A criminal complaint wasn't immediately available Thursday morning, but the county attorney's office said it would be filed later in the day.
Police said Heaggan-Brown is suspended and in custody, and they have launched an internal investigation. Neither a police spokesman nor the head of the Milwaukee police union immediately respond to messages seeking comment on the case from The Associated Press.
Heaggan-Brown, 24, joined the police department in July 2010 as an aide. Like Smith, Heaggan-Brown he is black. He was assigned to patrol the city's heavily minority north side.
Police Chief Edward Flynn has said that Smith was fleeing from a traffic stop when he was shot. Heaggan-Brown's body camera showed that Smith was shot after he turned toward an officer with a gun in his hand, according to investigators.
Smith's death sparked two nights of violence in the area's Sherman Park neighborhood, with several businesses burned. It also ramped up long-festering racial tension in Milwaukee.
The Wisconsin Department of Justice investigated Smith's death and has turned the case over to Milwaukee County District Attorney John Chisholm for a charging decision. It's not clear when a decision in that case will be made.
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