Jason "Mayhem" Miller, troubled ex-MMA fighter, was arrested for felony domestic violence in L.A. ... after allegedly getting physical with a woman, TMZ Sports has learned.
40-year-old Miller was taken to jail ... and his bail has been set at a whopping $1.385 million.
He is still currently in custody.
Our law enforcement sources tell us cops in the San Fernando Valley received an emergency call before 3 AM Friday morning ... made by a female who was screaming on the phone.
Police -- lights and sirens blaring -- raced to the scene code 3 .