Oak Creek police have arrested the man who called 9-1-1 to report a domestic disturbance at an apartment.  Investigators say the suspect killed his 48-year-old mother and injured his 24-year-old brother early Tuesday morning.  No names have been released.  The suspect is thought to have used a handgun, a knife and a blunt object of some sort to cause the injuries.  He’s being charged with first-degree intentional homicide and first-degree attempted intentional homicide.