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Video shows former NFL player Zac Stacy beat ex-girlfriend in front of baby

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Zac Stacy's ex-girlfriend Kristin Evans said she wanted to make sure to remain conscious during the altercation because Stacy "was in a rage." Home surveillance captures the moments Stacy physically assaulted Evans in front of their 5-month-old child while visiting the pair in Florida. NBC News’ Maura Barrett has the latest.