Sly has hit out at serial killer Paul Denyer after he was refused parole, 30 years after killing three women.

The veteran crime writer has done a Stan special on Denyer called “No Mercy, No Remorse” and issued those same sentiments on 3AW Breakfast.

“He’s shown no remorse, he’s bone lazy, he’s got no ambition and he’ll stay where he is,” Sly said.

Press PLAY to hear him hit out at Denyer + shed more light on the murders 

Image (Denyer): Nine News