Son, 15, accused of killing mother Convicted pedophile also charged in caseBy LOU MICHEL News Staff Reporter 9/11/2005 The 15-year-old son of a West Side woman whose dismembered body was found in the Black Rock Channel last month was arrested Saturday along with a 50-year-old convicted pedophile who police say assisted the teenager in the killing. Angel Rosa is accused of giving his mother, Madeline Irene, narcotic pills, and when she became incapacitated, strangling her with a cord in their Fargo Avenue home, according to Buffalo homicide investigators. A possible motive for the killing, police say, involves a friend of...