BROCKTON, Mass. — Police have arrested a man they say killed a man by striking him over the head inside a Brockton apartment.A spokeswoman for Plymouth District Attorney Timothy Cruz says Michael Pircio is scheduled to arraigned Tuesday on a murder charge in connection with the death of 29-year-old William James Porter.Authorities say the suspect struck Porter over the head with an object during an altercation inside the victim's apartment at about 1 a.m.