Zachary Pritchett , 19 , charged with murder and aggravated assault . Melizza Wiley 's mother , Teen , 53 , was found dead in Philadelphia home from stab wounds to her face , neck and upper torso . Grandmother Joan Wiley , 73 , suffered multiple knife wounds and remains in critical condition . Neighbors say Pritchett was being kept locked up in a back room .
Zachary Pritchett , 19 , charged with murder and aggravated assault . Teen 's mother , Melizza Wiley , 53 , was found dead in Philadelphia home from stab wounds to her face , neck and upper torso . Grandmother Joan Wiley , 73 , suffered multiple knife wounds and remains in critical condition . Neighbors say Pritchett was being kept locked up in a back room .