The UK and the US have agreed to amend an “anomaly” that allowed Harry Dunn’s death suspect Anne Sacoolas to claim diplomatic immunity, according to the BBC.
A court hearing last month heard that the “secret agreement” permitted Mrs Sacoolas – the wife of a diplomat at RAF Croughton, Northamptonshire – to return to her home country.
She has been accused of killing the 19-year-old motorcyclist in a crash near the base last August.
Mr Dunn’s mother, Charlotte Charles, said the change was a “huge step forward”.
Ms Charles told the Press Association (PA) the family’s campaign would continue for Mrs Sacoolas to return to the UK.
“We always live with hope that one day she might just decide of her own accord to put herself on a plane and come back over here,” she said.
Ms Charles said she wanted Mrs Sacoolas to “see what her own country has agreed to with the anomaly they’ve now amended”.
The foreign secretary has said relatives of US staff at the air base can face prosecution under the amended rules where they may previously have been immune.
Dominic Raab said the new arrangements had “closed the anomaly that led to the denial of justice in the heart-breaking case of Harry Dunn”.
He said: “We have the deepest sympathy for Harry Dunn’s family. No family should have to experience what they have gone through and I recognise that these changes will not bring Harry back.
“However, I hope that the knowledge that the Croughton arrangements have been revised and that a family in their position would now see justice done brings some small measure of comfort.”