INSIDE THE SECRET PRISON LIFE OF KILLERS

Their chilling hobbies and unsettling habits have been revealed

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MATTHEW MILAT

He's the nephew of Australia's most notorious serial killer Ivan Milat, and is currently serving 43 years for the murder of his school friend in 2010.

Nathan Paddison, a former inmate and ex-gang leader turned true crime YouTuber, revealed a few months ago how he'd served time at Lithgow Correctional Centre at the same time as Milat.

He alleged the murderer was "into witchcraft and wizardry" and that other prisoners saw him attempting different rituals with "symbols around him" on papers in his cell.

But, says Nathan, he was "strange as and super nice, but definitely weird".

SEF GONZALES

Incarcerated at Lithgow Jail serving a life sentence for the 2001 murders of his mother, father and sister, Gonzales works as a "jail maid", cleaning the reception area of the prison.