The 49-year-old walked out of her home in Melbourne's north-west at around 10am after an argument with her husband over money.
The last thing Karen reportedly told her husband, Borce Ristevski, was "I’m going to go and clear my head."
Now a man, who has chosen to remain anonymous, has revealed chilling comments Borce Ristevski said to him in the months leading up to his wife's murder.
In a 7 News exclusive, a man claims he first met Mr Ristevksi through a mutual friend in South East Asia in March last year.
“The first time I met him… he sent shivers down my spine,” the man said.
“I asked him a few questions… if he was married and that, he didn’t reply back to me. I found that a bit weird.”
But it was another comment Mr Ristevski allegedly made that prompted the man go to police when he heard news of Karen Ristevski’s death.
“This is a good place to get rid of somebody,” Mr Ristevski allegedly said while the pair were catching up over a few drinks.
“It’s not like something you say to someone you’ve just met. There was something eating me up inside saying I should report it to police.”
Police have confirmed they are investigating the man’s claims.
This article originally appeared on Marie Claire.