Peter Dupas

Australia is no stranger to serial killers.

This includes the backpacker murderer Ivan Millett, David and Catherine Burney, Eric Edgar Cook, Peter Dupas, Matthew Day Grunchy, who, by the way, was released after only serving 23 years.

How this heinous murderer who brutally killed his family is a free man? Well, that goes over my head.

The Claremont Killer, the Frankston Killer, John Wayne Glover, also known as the Granny Killer, and so many others.

And when they take that away, that is only reserved for the worst of the worst.

So the types of people who are serving the same sentence, life without parole, we've got the likes of Peter Dupas, a serial killer from Melbourne, Martin Bryant, the man who carried out the Port Arthur massacre.

And the other woman who fits into this category is a woman called Catherine Knight, who committed a very gruesome murder in New South Wales about 25 years ago.

The sort of stuff that it's too shocking to even describe.