The muscle-bound killer of Melbourne crime lord Carl Williams is providing cruel fitness advice to the ex-wife of the slain gangland boss from behind bars.
Matthew Johnson was sentenced in 2011 to life in jail with a non-parole period of 32 years for the brutal execution of Williams inside Barwon Prison.
But his incarceration has not stopped him from continuing to taunt his victim's family from within the jail's state-of-the-art high security unit: Olearia.
Matthew Johnson as he appeared on the Facebook profile he used to taunt the ex-wife of Carl Williams. Johnson killed Williams in jail after it was revealed he had turned into a police informer
Matthew Johnson took to social media to taunt the ex-wife of Roberta Williams after he watched her attack a reporter on television. Johnson murdered Carl Williams with the stem of an exercise bike
Carl Williams smiles from the prison dock after being sentenced to jail over a series of gangland murders. Matthew Johnson violently wiped the smile off his face and continues to laugh at his family even from behind bars
With the help of an associate outside jail, Johnson took to social media a day after Roberta Williams appeared in a bizarre television interview, in which she attacked a reporter.
'Stop sooking Roberta and go get on a treadmill,' Johnson posted to Facebook - to the amusement of his friends and followers.
A Current Affair reporter Reid Butler was throttled by Williams during the interview after he reminded her ex-husband had been a ruthless killer.
'You're going to die, you dog,' Williams yelled during the attack.
She declined to comment on Johnson's remarks when contacted by Daily Mail Australia.
Corrections Victoria spokesman Michael Gleeson said prisoners do not have access to the internet and cannot upload or publish information themselves.
'Under the Corrections Act 1986, it is an offence for a prisoner to possess a mobile phone or electronic device, or for any person to introduce contraband into a prison. These offences carry a maximum penalty of two years’ imprisonment,' he said.
Opened in 2016, the $36 million unit is officially a prison within a prison, separated from the rest of Barwon and housing its own visits centre and medical wing.
'He's very closely monitored. He doesn't have access to the Internet or a phone or any of that stuff,' a prison source said.
But authorities believe Johnson had been operating the social media page with help from either a friend or family member on the outside.
Matthew Johnson is one of the most feared men in jail. Known as 'The General' he heads the Prisoners of War prison gang and continues to taunt his victims from Barwon Prison's toughest unit
A haunting image captured on CCTV from within Barwon Prison. It shows Carl Williams reading a copy of the Herald Sun before he is bashed to death
Several family members appeared to be friends with him on Facebook, where he was affectionately referred to as 'The General'.
Corrections
