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DALLAS -- A Dallas police officer who pleaded guilty last week to assaulting his estranged wife resigned Monday.

Senior Cpl. Kristoffer Lewis received two years probation in a plea deal with prosecutors.

His resignation came after Police Chief David Brown recently acknowledged that the department had made a mistake in not taking disciplinary action sooner.

News 8 reported last month that no disciplinary action had been taken, even though internal affairs investigators sustained several allegations against Lewis nearly two years ago over a 2011 confrontation with his wife.

Starr Lewis, Lewis's ex-wife, previously told News 8 in exclusive interview that she was frustrated with the department's handling of her husband's case.

Lewis was accused of slamming his wife's head into a door frame and punching her in the back. He received deferred adjudication probation, which will leave him without a conviction if he successfully completes probation.

A misdemeanor count of violation of a protective order was dismissed.

Their divorce was also finalized last week.

E-mail teiserer@wfaa.com

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