Australia's legal system is a little more hesitant when it comes to giving someone a life sentence, which means that the convicts who have received more than one life sentence without parole must have done something truly horrible.
One of the four women serving life sentences without parole in Australia is Katherine Knight, who was actually the first woman to receive this penalty when she killed and mutilated her husband in 2001 and served his remains to his four children.
To those who knew Katherine Knight as a girl, she was a model student who frequently received awards for her good behavior.
But things at home weren't so nice.
Her father was an alcoholic who raped her mother repeatedly every day. Katherine herself was also frequently molested by her family members. One of her mother's other lovers even forced Katherine to take part in a sexual act with her mom.
After decades of marriages that ended in Katherine performing violent (but never deadly) acts on her husbands, she started a relationship with John Price.
For years, Knight's rage made it impossible for Price to allow her to live in his house.
Knight got him fired from the job he had for 17 years, and one fight led to him getting stabbed. The wound wasn't fatal.
After the stabbing, Price kicked Knight out of his house for good.
Or so he thought. He told his coworkers that if he didn't come to work, it was probably because she murdered him.
Sure enough, Knight stabbed Price in his sleep with a butcher knife 37 times. She then proceeded to skin him and hang his body from a meat hook.
She cooked parts of his body with various vegetables and placed four bowls of the frightening stew on the table for Price's children.
Blood was found everywhere on Price's property, so it didn't take long for police to investigate. Knight became the first woman to receive a life sentence in Australian history. She attempted to appeal this sentence in 2006, but the judge said that her crime was "too appalling" to be appealed.