Robert Lancaster, 76, who lives on the same Wynnefield block as Mayor Nutter, was beaten to death in his house last week, authorities said yesterday.
A relative found Lancaster dead in his second-floor bedroom with a pillow over his face Thursday morning.
Police initially said that Lancaster, who lived alone on 50th Street near Woodbine Avenue, had suffered trauma to the left side of his face.
A medical examiner determined Saturday that he had died of blunt-force trauma to the head. As of yesterday, police had no suspects and knew of no motive for the slaying.