From all outward appearances, John Wayne Gacy Jr appeared to be born for anonymity. The second child and only son of John Stanley Gacy, an auto repair machinist and WWI veteran, and Marion Elaine Robinson, a housewife, Gacy Jr seemed to be destined to be another nameless face in the crowd, lost in the mass of humanity with which his Chicago home was overrun. Nobody who knew him would have ever imagined the kind of monster that lurked within his very common exterior.