Does William Afton die in the fourth closet? The answer is yes! Read the article below for more info

The Fourth Closet
In The Fourth Closet, we see William Afton after his animatronics have captured Jessica at Circus Baby's Pizza. He is in a wheelchair and very weak. He is bald and missing an eye with a ton of grafted skin. He was also said to be painfully thin. He explains to Jessica that the baldness and grafted skin came from prying himself out of the Spring Bonnie suit and also clarifies that he uses his real name and not Spring trap.

That when he was in the suit, he was on a power trip and tells Jessica he no longer goes by Spring trap. However, parts of the suit are still lodged in his body and it is VERY painful for him to move (Jessica obviously doesn't feel sorry for him). He has been capturing kids for an experiment with a combination of all the original Freddy's animatronic's endoskeletons.

It is revealed all the murdered children's souls are still the combination of endoskeletons and are in pain. Once Afton injects a glowing liquid into Carlton (most likely remnant), Carlton Burke can talk to the souls of his friends who think William Afton is friendly and he explains that William Afton himself is the one who murdered them.

They then subsequently take hold of the animatronics once more and throw William Afton, the murderer, into a furnace, where he finally dies and the souls of the children fade away. It's later revealed that William Afton in the Spring Bonnie suit actually murdered Charlotte Emily, the daughter of Henry, who was an old friend of William Afton, even co-owner of Fredbear’s Family Diner, and before Freddy Fazbear’s Pizza in 1983, three years after Charlotte Emily was born in 1980.

I love the ending of this book. Thanks for explaining this! I really just wasn't sure if the furnace actually KILLED him or not, since he did survive two springlock failures.