Force with cold case track record
Merseyside Police did not wish to comment on the case, or elaborate on the retired detectives’ work.
But it is not the first time the force has released some of its old hands to help crack cold cases.
In 2005, a team was set up to tackle unsolved murders in Merseyside, bringing a squad of former officers out of retirement.
By using modern forensic methods, including DNA testing and facial imaging the “serious crimes review team” promised to go over murders with a “fine-tooth comb”.
It came after an audit revealed at least 22 murders in Merseyside were still unsolved.
In 2013, Greater Manchester Police used the experience of past colleagues to help deal with child abuse cases.
Greater Manchester Police and Crime Commissioner Tony Lloyd set up a £100,000 fund to pay them.
He said: “Setting up a pool of retired detectives, who can be called on as and when they are needed, is a smart way to reduce some of the pressures on Greater Manchester Police.”