A State Police trooper was arrested after he allegedly assaulted his girlfriend and tried to choke her.

State Police said the 45-year-old trooper, Robert Sundberg, violently assaulted his girlfriend in their apartment and put her in a chokehold at one point. When he fell asleep, she allegedly ran out of the apartment and called 911.

Sundberg, who is assigned to the Concord barracks and has been a State Police officer for 14 years, was arrested and charged with domestic violence. State Police said he was been relieved of duty and his license to carry a firearm was suspended.

At a duty status hearing on Monday afternoon at State Police Headquarters, Sundberg was ordered suspended without pay indefinitely.

Prosecutors said Sundberg was drunk when he assaulted the woman. The defense said at Sundberg’s arraignment that the pair are both troopers at the same barracks and that they have been living together for about a month. Sundberg’s attorney said his girlfriend was just angry that he was breaking off their six-year relationship.

The judge in the case issued a one-year restraining order against Sundberg, who is ordered not to see the victim. A dangerousness hearing has been scheduled for Wednesday.

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