Hunting Mr. Cruel - Under Investigation with Liz Hayes

https://en.m.wikipedia.org/wiki/Mr_Cruel

Autralian Crime Stories - Mr. Cruel: Nightmare in Melbourne:

https://www.youtube.com/watch?v=ArIl4189jDw

Sensing Murder - Cruel Intent:

https://videa.hu/videok/film-animacio/sensing-murder-cruel-intent-karmein-1992-australia-deb-webber-LtLZYaqnLuWex4pY

This killer reminds me of Joseph James DeAngelo, the Golden State Killer in California, USA, who did the same wiith his victims...tied them, ate in their home during his crimes.
Karmein Chan Case: "Suburban fortress with electric front gate" (the Chan Family's home)...maybe he is a security system expert, like BTK Killer, Dennis Rader was...
"Around 27.000 suspects interviewed..." I think, the killer was one of them...
Karmein was his last known! victim there, but a serial killer never stop, enjoy the hunt. Maybe he died or use wheelchair, perhaps moved...
Definitely solvable case, especially if someone recognize this sketch. But the DNA Technology and Genetic Genealogy are also great things!