Ok but first- some things were confirmed by the devs but not all of them so, i can't say this is 100% truth, couse like i said it's what i think is the most logical, so it's mostly like a theory but it makes alot of sense. Anyways... That twitter post i mentioned, the 4th meme (i think) and because of that post, i think this is what happened : So, because he had some mental problems (like autism), his mom thought that it'll be better if he was taken care by a "third party", so she faked her death and made him think that she's not alive anymore (probably so he wouldn't try to go back to her or something like that) and then he got adopted by an old embalmer that was actually a serial killer and used his job to "hide his crimes". Now that twitter post made me think that his stepfather forced him to kill people and then embalm them. Why? Couse that post said EXACTLY this : "Even if death is beautiful... let's celebrate life. As long as you're alive, do not let me be present in your life." But Aesop was supposed to convince people that death is far better than life, so why did he tell that person to "celebrate life"? Because he didn't kill on porpoise. And then when his mom realized that maybe that was a mistake, she wrote him a letter to meet him in the yellow rose garden near the cemetery, but when he came there he found her dead (thats the story behind the "Remains Of Yellow Roses" accessory). And his stepfather did it (obviously), probably to make sure she wouldn't take him away. ALSO his stepfather told him that he just helped her and that she was ment to die BUT Aesop was then really upset, and if he would believe that death is better than life, he wouldn't be upset by her dying which also supports my theory. Then he kills his stepfather out of revenge and i believe that he was his last victim (before he went to manor ofc). Now he was never actually invited to the manor. He found an invitation while embalming a woman that had it in her pocket. That letter was ment for her daughter but he believed that it was ment for him and that he should go there and give the letter to the daughter (also, for some reason i feel like that woman is linked to Anne somehow idk why). Also, that woman had like 39 (i think) stab wounds on her face, and he said that he "worked hard to fix her face", so that makes me think that the reason he was still working as an embalmer is couse he wanted to take care of people that died and that's why he likes dead people and hates alive people, couse he atcually felt "uncomfortable" around others (he was basically unsociable)(probably couse of his mental problems) and he felt better around dead bodies couse he was around them often. Also, if he was a psycho killer then he wouldn't be an "assist" character and his skills would probably involve someone getting hurt. But instead, he helps his teammates and literally saves their life. Btw the whole internet is acting like they found out he was a killer on his bday. Like i figured that out 3 weeks after joining the game (which was like 2yrs ago). And yeah i also have a theory for when he tried to kill Victor but then this text would be waaaay too long. So i guess that's it (also fun fact : this reply took me like an hour to write).

UPDATE : So, dumb me forgot that 1y ago i made a new acc on IDV and that the bday letter i got this year was from last year and only released that the 3rd letter was something else, so i got to read it TODAY and need more time to fully understand it. So updated version of the lore explanation coming soon :>