"Apparently Simon went to his ex-wife's home to return the dog he was watching," Orange County, Calif., sheriff's spokesman Jim Amormino tells PEOPLE. "According to the victim, he threw a retractable dog leash at her, she lifted her arm in a defensive move, and it struck her wrist."
Simon Barney, who filed for divorce from Tamra earlier this year, was arrested for domestic violence and faces arraignment Tuesday. Sheriff's deputies also placed an emergency protective order against him.
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