The black Milwaukee police officer who reportedly shot Sylville Smith, sparking days of violent protests, is an amateur rapper who sang about rioting.

The officer, identified by the Milwaukee Journal Sentinel as 24-year-old Dominique Heaggan-Brown, has been an officer of the Milwaukee Police Department for three years. One of his hobbies is performing locally as “KB Domo,” often collaborating with hip-hop artist Dae Flywalker, according to the New York Daily News.

In a 2015 music video titled, “Monster Freestyle,” KB Domo sports a blue Brewers hat and raps the lyrics: “Mess with my circle, Imma start a riot like it’s Baltimore.”

The video was released two months after riots rocked Baltimore over the police-involved death of Freddie Gray, the Daily Caller reported.

In a Tuesday interview with the music website Breaking and Entering, Dae Flywalker confirmed Officer Heaggan-Brown is KB Domo, and said he had known the officer since grade school.

“I was aware that he was an officer like most people,” the rapper said. “When we did have a chance to hang out, it was pure kicking it, or he would pop up at some of my shows in support sometimes. With him working the job he works and the hours he put in and me being focused on my music career and work in the community, we didn’t get the opportunity [to talk about his police career].

“We did the ‘Monster’ freestyle last year and other music prior,” he said. “He’s the one who got me rapping in the first place.”

The Milwaukee Journal Sentinel, which independently confirmed the officer’s identity, reported that the officer has been the target of threats since commenters posted his home address online in the wake of 23-year-old Smith’s death. The officer fled town and is staying with relatives, Police Chief Edward Flynn said.