William Afton didn't actually die, in most stories it claims his soul was traped in the body and he died after that. The actual story starts off as him doing everything in the other stories, but thats where the thing comes in after his soul is stuck he actually found a way to get out of the suit many years later, he was deeply hurt but he managed to get help and support by Clara which is now his wife. Years later his soul was immuned to the spring lock suit so he could turn into springtrap. As the other stories end in a bad death the original story ended a happy ending for William.
