I watched the first episode of that.
Dude is fucking strannnnnnge.
For those that haven't heard of this, there was a mortician in CA back in the early 80s whose family was in the funeral home business and he took control of the creamatorium. At the time (no idea what it's like now), it took roughly 2 hours to cremate a body between burning it and letting the oven cool down enough to get the ashes out so they could be returned to the family. Cost was roughly $250/body.
He started charging like $55/body. The crematorium went from burning 165 bodies in a year to like 3600+.
Turns out he was breaking corpses up, folding them up, and stuffing as many as he could into an oven at a time. So instead of burning one body, he'd burn like 15 at once. Then all the ashes would get mixed together and when people were getting their loved ones' ashes back, it was a bunch of ashes mixed up from a handful of people.
Then it turns out he was busting the teeth out of corpses to get the gold out of 'em and more.
Gets more nefarious from there.