A man who shot dead his daughter’s ex-partner and her ex-partner’s father over the custody of his grandson has been sentenced to life in prison.

Stephen Alderton, 67, who had pleaded guilty, was sentenced at Cambridge Crown Court to life in prison with a minimum term of 25 years for the murders of father and son Gary Dunmore, 57, and Joshua Dunmore, 32, who were shot dead in two villages six miles apart in Cambridgeshire in March.

Judge Mark Bishop described the murders as an “execution”. He added: “You took the decision to take the law into your own hands and end the lives of two innocent men.”

Alderton, of no fixed address, was arrested hours after the shooting by armed officers on a motorway. He told police that “sometimes you have to do what you have to do even if it’s wrong in the eyes of the law”, according to prosecutor Pater Gair.

“We say it’s clear that the events were triggered by an ongoing family court case between this defendant’s daughter Samantha Stephen, nee Alderton, and her former partner Joshua Dunmore,” Mr Gair added.

“This concerned a request to move their seven-year-old child from the jurisdiction of the court by emigrating to the USA.”

This breaking news story is being updated and more details will be published shortly.

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