Johnny Manziel Indicted for Assault Against Former Girlfriend

Colleen Crowley alleges he struck her on her left ear after an argument.
1:38 | 04/26/16

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Transcript for Johnny Manziel Indicted for Assault Against Former Girlfriend
We turn to Texas this evening, and new trouble for one-time star quarterback Johnny manziel. Tonight, indicted on a misdemeanor charge for allegedly assaulting his girlfriend. Now facing the possibility of a year behind bars. His lawyer tonight saying manziel will plead not guilty. But it does come after manziel's own family has sounded the alarm about his health. ABC's kayna Whitworth in Texas. Reporter: Johnny manziel, once a cover boy, tonight, has a mug shot in his future for that assault charge. His former girlfriend, Colleen Crowley, claiming an argument last January turned physical. In this affidavit, she alleges manziel struck her "With his open hand on my left ear," and she could not hear out of that ear. Our defense is that we are not guilty. Reporter: Tonight, manziel's defense team claims Crowley was inebriated and tried to live their argument and was unfit to drive. That's why he had to arrange for her to be driven home. Reporter: And that's the defense? Well, that's what happened. Reporter: We called Crowley and her attorney and have not received comment. This is the latest setback for the man known as "Johnny football." His substance abuse problems played out in public. He was cut from the Cleveland browns and lost lucrative endorsements. His father saying he fears his son will die if he doesn't get help. His lawyer telling ABC news he spoke with manziel ls night. Well, he's just ready to face this and get this behind him. Reporter: Manziel has to turn himself in here in Texas. He faces up to one year in jail and a $4,000 fine if convicted. David?

This transcript has been automatically generated and may not be 100% accurate.

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