Chris Afton died as the infamous victim of the Bite of ‘87, the events of which can be traced back to Elizabeth Afton’s death. Elizabeth’s death is what initially drove William mad to the point of resorting to extreme measures. He could not let any of his children near his animatronics, and those that were fond of them were to have that fondness eliminated by all means necessary. As such, William mentally tortured Chris by showing him nightmares of the very animatronics he loved, so much so that Chris came to tremble in the presence of them. This, of course, segwayed into Micheal’s incessant bullying as he would often jumpscare Chris by wearing a Foxy mask. The unchecked escalation of this behavior, caused by Chris’s forcefully-induced phobia at the hands of William, led to the Bite of ‘87.