More than 500 cold case murders in New South Wales will be reopened as part of a police blitz.

Every unsolved homicide committed since the early 1970s will be reviewed with priority cases sent off for further investigation.

This week, the first 20 cases are being sent off for investigation outside the Homicide Squad to allow a fresh set of eyes to scan for more clues.

Commander of the Homicide Squad, Detective Superintendent Scott Cook, tells Ben Fordham “no case will be forgotten”.

“I’ve had a look at what we’ve got on the books, and something needed to be done.

“This new process that we’ve implemented is to make sure there is more fresh eyes looking at cold cases.”

He tells Ben Fordham the process is necessary as “new technologies might open new avenues of enquiry”.

Listen to the full interview below