Have you heard of Ramon Rogers? He is thought to have dismembered 3 people. I believe 2 were found 3rd is speculation. I went down the rabbit hole on r/unsolvedmysteries and found u/Sandi_T mentioning her life as a "foster child" of Dorothy and Mike Rogers and that Ramon/Raymond was a fellow " foster child" and learned his methods from Mike and Dorothy who also abused u/Sandi_T along with the other "foster kids". The user did some thin air podcasts that may be worth listening to.
I’d never heard of Ramon Rogers before, but this is a very interesting case for sure.
To summarize a little, Rogers was sentenced to death in 1997 for the murder and dismemberment of two ex girlfriends, Beatrice Toronczak and Rose Albano, whose body parts were found in plastic bags. He was also found guilty for the murder of his friend Ron Stadt, although his body has never been found.
Rogers was the foster kid of Dorothy and Michael Rogers, who were persons of interest in the disappearance of a woman called Marie Ann Watson in 1977. She was in a middle of a custody dispute with the Rogers, who were taking care of two of her children, when she vanished. Considering that Michael Rogers pled guilty to raping one of his adopted daughters, it seems likely he’d abuse the other kids too. Not sure about the killing and dismemberment though.
In the Charley Project page for Marie Ann Watson, it says that police tried to link Ramon to her disappearance once he was arrested for the other crimes, but didn’t find any evidence. He would have been 18 at the time when she went missing.
Here is the post that Anon mentioned, with links to the podcast.