Slightly off topic, however thousands of people go missing in the US evey year and a large part of those are never found.
I strongly suspect there are (and have been) many serial killers prowling this country for a long time that never get caught.
The only reason whoever this was got noticed is they taunted the police.
Most just kill and keep quiet about it, many probably stay on the move traveling the country like Ted bundy did.
Israel Keyes is another good example.
If he wouldn’t have extorted money from one of his victims families he more than likely would never have been caught either.
https://en.wikipedia.org/wiki/Israel_Keyes
In the show “Mind Hunters” about the creation of the FBI’s profiling unit they used the recorded transcripts of various serial killers that they had interviewed as the script for the show.
One serial killer (Genius IQ) was told they interviewed him so they could catch any other serial killers out there. He responded something like; “ANY others? There are hundreds of us out there.”
BTW - the Green River Killer (Gary Ridgway, Seattle area) was a painter at the Kenworth Truck Company. I always thought painters’ vice was just booze.