Victoria Police Chief Commissioner, Ken Lay, has asked for allegations of corruption, linked to the murder of gangland figure Carl Williams, to be properly assessed.

The allegations were contained in emails from an unnamed interstate integrity body and were sent to Simon Overland, who was commissioner at the time.

The emails contained allegations of corruption between a public sector agency and a criminal identity, with a possible connection to the murder of Carl Williams.

He was bashed to death in Barwon Prison in April 2010.

A report from the Victorian ombudsman says Victoria Police had no record of the emails, the information they contained, or any action taken to respond to the allegations.

In a letter to the ombudsman, Mr Overland said the information in the emails was routine and unremarkable.

But the ombudsman found this assessment was at odds with the views of a number of senior police officers.

The ombudsman says it is concerning Victoria Police is unable to say how it responded to the allegations and calling for an immediate investigation.

The report also calls for an overhaul of record keeping practices.

Chief Commissioner Lay says he has noted the recommendations and says the emails will be properly assessed.

Carl Williams' lawyer, Rob Stary, says the report shows there are still unanswered questions about his death in prison.

"The process has been unsatisfactory," he told ABC local radio.

"It's inadequate, it's deficient, it's no wonder that confidence in the police force, in corrections gets eroded, because there's inadequate explanation as to what's occurred and why it's occurred."