Michael B. Cowsert, 50, of Algonquin.

A police officer has resigned after he was charged with unlawfully restraining a woman and battering her, causing injury, while he was off-duty in Algonquin.

Michael B. Cowsert, 50, of the 1300 block of Stonegate Road in Algonquin, was charged with aggravated domestic battery, unlawful restraint and four counts of domestic battery.

A criminal complaint filed in McHenry County Circuit Court alleges Cowsert got into an argument with a woman on August 14 and a struggle ensued over the victim’s phone.

Cowsert placed his hands upon a woman’s arms, causing red marks on both of her biceps, in an attempt to hold her down, the complaint said.

Cowsert pushed and threw the woman, who is a household member of his, to the ground, according to the complaint.

The complaint said the victim suffered great bodily harm, including a fracture to her hand and a swollen finger.

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The Algonquin Police Department responded to the incident and arrested Cowsert.

The man was released from custody after posting 10% of his $50,000 bond.

Arlington Heights Deputy Police Chief Greg Czernecki said Cowsert was employed as an Arlington Heights police officer since 1996, the Northwest Herald reported.

Czernecki said Cowsert resigned from the Arlington Heights Police Department last week on September 27.

The most serious charge against Cowsert is aggravated domestic battery, a Class 2 felony, which carries a sentence of three to seven years in prison.

Cowsert pleaded not guilty to his charges during an arraignment hearing on Friday.

A hearing on a motion to modify bond is scheduled for October 20.