After his own daughter got killed by the machine Henry created, Afton decided to kill Henry’s only daughter as revenge. He lured her off into the yard outside the pizzeria while in his springtrap suit, and killed her. In this moment, he felt the best he ever had, and went on to kill 4 more children, stuffing the bodies into the only place you would never think to look, inside the animatronics that performed there every day. The bodies and spirits of the missing children were trapped inside the animatronics, and could eventually control them on their own…
I wasn't