The 31-year-old fighter is still in custody in Clark County, Nevada according to online records.

Details surrounding his arrest have not been released — but we’re told the alleged victim is a female MMA fighter.

Case — who goes by the nickname “Johnny Hollywood” — is currently signed with the PFL (Professional Fighters League) and has a fight scheduled for the end of the month.

Case is 27-7-1 as a pro fighter and has had stints with some of the top MMA organizations in the world … including the UFC, where he fought from 2014 to 2017.

In fact, Case fought Frankie Perez on the undercard of the Conor McGregor vs. Dennis Siver card back in 2015 … and he won.

We reached out to Case’s camp for comment but so far nothing.