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WASHINGTON (WUSA9) -- The case of a D.C. police officer accused of attacking his pregnant girlfriend has been dismissed, according to court records.

Court records indicate that the case against 52-year-old Calvin Willis was dismissed Tuesday. The U.S. Attorney's Office has determined there is insufficient evidence to go forward at this time.

Willis was accused of kicking his 25-year-old girlfriend in the back and leg multiple times during an argument at her apartment. He also pulled her by the hair and slammed her into a wall, according to charging documents. At one point, the girlfriend tried to defend herself with a knife but abandoned that action when Willis placed his hand on his gun.

According to the documents, Willis met his girlfriend when she was 15-years-old. He had stopped her while he was on patrol one day and gave her his number. Willis, who is married and lives in Maryland, insisted they keep their relationship a secret. They have two children together, and now the woman is pregnant with a third.

Catch up on the case:http://on.wusa9.com/1u07Gjs

Read charging documents:http://on.wusa9.com/1lWvSy6

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