Her and her husband were sick af. It's good they got caught (relatively) early into their thing, they almost certainly would've continued on with that shit indefinitely if they could've.
Robert Durst killed at least 3 people and completely avoided justice because he was rich, at least until he outed himself on camera. There's a documentary on Hulu called The Jinx
I know in counties like Colombia, Brazil and Norway. I did some research and I found out about the cases of Arnfinn Nesset in Norway who killed at least 22 people in the early 80s and was released in 2004. Abel Mikaelsen Klemmensen in Greenland who killed 7 people at a party in 1989 and was released in 2015 and Australian criminal Berwyn Rees who was paroled in 2019 after serving 39 years in prison for killing three people including a police officer between 1977-1981. British Child killer Simon Smith who murdered three of his infant children between 1993-and-1997 who despite being sentence to a whole life term later applied against this sentence and it was reduced to 24 years-to-life and was released in 2020. Teenage serial killer Warren Harris in America who killed four people in the 1970s and given parole in 2024.
One of the creepiest kinds of murders that I've read about or watched on TV shows was the random murder. A murder where a killer just randomly kills someone in a random part of the country for no reason. The murderer just goes into a town or city they've never been to before, commits a murder, leaves and never returns. The murderer can leave traces and clues but none if would be connected to anyone or anything in the area .... no motive, no reason, no connection, no witnesses, no nothing .... just a murderer who kills someone for no reason and disappears ... and is capable of doing it again and again without ever being discovered.
This is exactly what I mean ..... just because someone committed one murder and got caught, it doesn't mean that they didn't commit multiple other murders that will never be known about.
Israel Keyes admitted to at least one of these but probably did tens if not hundreds. Had caches across the country of supplies and weapons. He was only eventually caught cause he got sloppy and I think had a body or something on his property at some point. Didn't admit a lot to the police cause he didn't want media attention and for his daughter to find out, a lot of information is gleaned from missing persons that coincided with where he happened to be at the time (phone pings, plane tickets, etc), and he traveled a lot.
There's a long-running podcast detailing what is known about him, called True Crime Bullshit.
I don’t immediately know what in particular transitions someone from killer to “serial” killer.
But I could see if it was someone who wiped out a van of people or a husband coming back home to his wife cheating with a couple and murdering them being potentially released after a long sentence.
Frans Hooijmaijers, Dutch nurse who killed between 5-259 people from 1970-1974. Was originally sentenced to life however this was changed in 1977 to 18 years imprisonment and Hooijmaijers was released in 1987. He died in 2006.