A longtime Macomb County commissioner arrested after a weekend domestic incident involving his girlfriend will not be charged, with the prosecutor's office citing "mutual combatants," according to the sheriff's office. But the incident apparently cost him his job.

Deputies were sent to Commissioner Don Brown's house in Washington Township on Sunday for a domestic incident involving his girlfriend. He was taken into custody and released pending review by the prosecutor's office.

"After their review of the warrant request presented by the Macomb County Sheriff’s Office, charges were denied citing 'mutual combatants,'" according to a sheriff's office release Tuesday.

Brown, a Republican who represents 10 communities in northern Macomb County, was placed on leave from the office of U.S. Rep. Paul Mitchell, R-Dryden, where Brown is senior outreach coordinator.

And later Tuesday, Mitchell's office announced that the congressman "met with Mr. Brown earlier this afternoon, at which time Congressman Mitchell accepted Mr. Brown’s resignation."

The sheriff's office didn't release any additional details of the incident, including what specifically happened at Brown's house.

Brown released the following statement:

"This is my personal issue within my private life. We had a disagreement that became emotional for each of us. My girlfriend called the police to defuse the situation. She did not intend to see me charged or arrested. We will continue to enjoy our great relationship while working on improving our communication differences. Please respect our privacy."

Brown represents Shelby, Washington, Bruce, Ray, Armada and Richmond townships, the villages of Romeo and Armada and the cities of Memphis and Richmond, according to the county commission website.

Brown, 55, a father of four, has been a county commissioner since 1990, according to www.donbrownformacomb.com. He won re-election to another two-year term in November.

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The longtime Washington Township resident previously worked as deputy district director for former U.S. Rep. Candice Miller, who is now the county's public works commissioner; has served as southeast Michigan liaison for the Michigan Department of State, and as associate director of former Gov. John Engler's southeast Michigan office, according to his biography on the websites.

Brown was arrested in August 2017 and charged with operating while visibly impaired in Sterling Heights after his pickup hit the back of a police car that was stopped on Mound Road near 18½ Mile Road for a traffic stop, city authorities said. An officer was inside the car, according to a police report.

The report states that Brown registered 0.072 on a preliminary breath test, with later breath tests showing a blood-alcohol level at 0.05. The levels were under the legal limit for an adult driver in Michigan.

The charge was reduced to failure to yield to a stationary emergency responder, and Brown was sentenced to one year of probation and fines and costs in May, according to 41-A District Court in Sterling Heights.

Contact Christina Hall: chall@freepress.com. Follow her on Twitter: @challreporter.