This is a pretty horrific crime.

Amar’e Stoudemire’s younger brother Jerrel was arrested in Kansas Monday night — after allegedly kidnapping the mother of his child, repeatedly beating her and then locking her in a basement … TMZ Sports has learned.

We’re told … officials believe Stoudemire went to the woman’s home and waited for her to arrive. When she pulled up, he rammed his car into her vehicle … and then pulled her out and beat her.

Stoudemire allegedly dragged the woman into the basement of the home and continued to attack her for several hours.

We’re told the woman’s daughter eventually found her naked and unconscious in the basement.

He needs to spend a long time in jail if this is proved to be all true.