UFC fighter Rachael Ostovich's MMA fighting husband has been arrested for ATTEMPTED MURDER days after allegedly breaking his wife's face ... and is still behind bars in a Honolulu jail.
TMZ Sports broke the story ... Ostovich -- who was scheduled to fight Paige VanZant in January -- was hospitalized this weekend with serious injuries -- including a broken orbital bone -- after her husband allegedly assaulted her during an argument at their home.
Cops in Honolulu had opened a domestic violence investigation ... and now police officials tells us 27 year old Arnold Berdon -- Ostovich's husband and father of her child -- was arrested this evening on suspicion of 2nd degree attempted murder.