Roberta Williams believes her slain ex-husband Carl Williams could have been responsible for more murders than the four he was convicted of.
Letters found on a prison computer used by Williams could implicate him for two more murders, Roberta told Channel Seven’s Sunday Night.
'Maybe two ... names have come up on his computer,' Roberta said said.
Roberta, who won access to her ex-husbands computer and uncovering letters he had written to his daughter, girlfriend and criminal associates, said she was more upset about the affairs she uncovered, however soon realised the severity of the crimes.
'To kill somebody is just not on,' Roberta said. 'Nobody's got any right to take anybody's life.'
Williams pleaded guilty to the murders of Lewis Moran and his son Jason, Mark Mallia and Michael Marshall.
Williams was killed in prison in 2010, after it emerged he had become a police informer.