DeMarco Murray's Ex-Teammate -- Arrested for Assault ... Allegedly Brutalizes Wife

Ex-Oklahoma RB Brennan Clay -- who famously accused ex-OU teammate DeMarco Murray of banging his wife -- was arrested for assault after allegedly terrorizing his spouse ... TMZ Sports has learned.

We've learned ... Clay was arrested in Dallas County, TX on January 27th after his estranged wife Gina told cops he kicked down her door and proceeded to beat the crap out of her.

According to the police report, obtained by TMZ Sports, Gina claimed Clay threw her on the kitchen counter, dragged her downstairs, dragged her through shrubbery and then began to choke her.

Gina says he brought her back into the house and "began punching and throwing her around the residence."

Eventually, Gina was able to call police ... and when they arrived, officers noticed her right leg was bleeding with several cuts. They later located Clay in a nearby alley and arrested him for assault.

Clay filed for divorce a few months ago after accusing Gina of sleeping with Murray ... an allegation that Murray adamantly denied. Clay eventually recanted his accusation and apologized.