Underbelly gangster killed in prison

Carl Williams as portrayed by Gyton Grantley on <i>Underbelly</i>. Photo / Supplied

Convicted Australian gangland killer Carl Williams has died after he suffered head injuries and went into cardiac arrest in prison, his lawyer says.

An Ambulance Victoria spokeswoman said paramedics arrived at Barwon Prison about 1.18pm (3.18pm NZT) today to find him in a critical condition.

Two independent sources said the man was Williams, as did his lawyer, Rob Stary.

Williams was serving life imprisonment in Barwon's maximum security Acacia unit with a non-parole period of 35 years for ordering the murders of three underworld rivals and the failed conspiracy to murder a fourth person.

He was found guilty of murdering Jason Moran, Lewis Moran and Michael Marshall.

He had one child, a daughter, with his ex-wife Roberta Williams, a convicted drug trafficker.

He was portrayed by Gyton Grantley in Underbelly, a television drama based on the events of Melbourne's gangland wars from 1995 to 2004.

Williams' father George was released from prison in June 2009 after serving a sentence for drug trafficking, while his mother Barbara was found dead in 2009 after an apparent overdose.

Underworld figure Mick Gatto said he had heard rumours about Williams having died but said that was all he had heard.

"I would rather let dead dogs lie," he told AAP.

"If you hear any more let me know but I would rather not comment on him."

He said Williams was "certainly not" a friend.

- AAP