Serial killer Patrick Mackay, one of Britain's longest serving prisoners, will remain behind bars amidst a fresh investigation into more killings.

Mackay, who used to live in Dartford and Gravesend areas, was jailed in 1975 after confessing to a string of brutal murders, but has recently been considered for release after reportedly spending time in an open prison.

Police are now believed to be investigating a number of further killings linked to Mackay, who was convicted over 11 deaths including that of Father Anthony Crean - who he hacked to death with an axe and left in a blood-filled bath in the village of Shorne.

Dartford MP Gareth Johnson said: "I believe that Patrick Mackay should never be released from prison and certainly not whilst he is under suspicion for other unsolved murders.

"It is right that Essex police have agreed to re-investigate one of these murders before the parole board makes its decision.

"I will continue to closely follow the situation as I am deeply concerned Patrick Mackay could be released and able to live back in Dartford fairly soon."

A spokesman for the Parole Board said: “We can confirm the parole review of Patrick Mackay has been referred to the Parole Board and is following standard processes.

“Parole Board decisions are solely focused on whether a prisoner would represent a significant risk to the public after release and whether that risk can be managed in the community.

“A hearing date will be scheduled in due course and the panel will carefully look at a range of evidence, including details of the original case, and any evidence of behaviour change.

“Parole reviews take place with great care and public safety is our number one priority.”

Essex Police were unable to provide further information surrounding the recent investigation.

Read more: all the latest news from Dartford.