An Atascadero man was arrested early Monday after he beat up his live-in girlfriend, according to Atascadero police.
Police arrested Wayne Masters, 52, shortly after 2 a.m. on the 5300 block of Traffic Way.
Police said they were sent to the scene and found Masters assaulting a woman, who had been struck with a hard object and was bleeding from a head wound.
Officers took the woman to a local hospital, where she was treated for her injuries, then released.
Masters was booked into San Luis Obispo County Jail on suspicion of felony domestic violence and assault with a deadly weapon.