MMA fighter Johnny Case -- who once fought on a Conor McGregor undercard -- was arrested in Las Vegas on Thursday for domestic battery, TMZ Sports has learned.
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.