A RANCH where notorious US mass murderer Charles Manson hid after a 1969 killing spree is being revisited by scientists to hunt for undiscovered graves, decades after law enforcement officers first raided the site.

A ranch where notorious US mass murderer Charles Manson hid after a 1969 killing spree is being revisited by scientists to hunt for undiscovered graves, decades after law enforcement officers raided the site.

The police chief in the remote region where Charles Manson hid after a killing spree in the summer of 1969 said tonight he will allow researchers to begin digging in search of possible human remains.