WAUKESHA, Wis. (AP) – Waukesha police have arrested a domestic violence suspect following a standoff and say a missing woman is a possible victim.  Police were called to a residence in Waukesha about 6:20 a.m. Wednesday. Officers knew the owner of the home had firearms and had previously threatened to shoot police.  No one at the residence responded when officers went to the front door and tried calling the house. Police say the possible victim at the home did not show up for work and remains missing. Tactical officers and an armored vehicle were sent to the scene.  The suspect turned himself into officers about four hours later. Officials say he has not cooperated with investigators.