The mother of Harry Dunn has urged presidential candidate Joe Biden to reconsider the US's position on her son's alleged killer should he win the election.
In a video message to Mr Biden, Charlotte Charles said her "heart goes out" to him after the loss of his son in 2015 – but said her family needed justice in order to "help us on the path" to recovery.
Mrs Charles's 19-year-old son was killed when his motorbike crashed into a car outside a US military base in Northamptonshire on August 27 last year.
The US asserted diplomatic immunity for suspect Anne Sacoolas following the crash and she was able to return to her home country – despite later admitting she had been driving on the wrong side of the road for 20 seconds before the teenager's death.
US Secretary of State Mike Pompeo rejected an extradition request for 43-year-old Sacoolas after the CPS charged her with causing Mr Dunn's death by dangerous driving – describing the decision as "final".
Mrs Charles appealed to Mr Biden to "do your best to amend" the situation – saying Sacoolas "walking free" was "tearing us apart as a family".
In her video message, seen by the PA news agency, Mrs Charles said: "I would imagine you are aware of Harry's case and our campaign – we've been running it for a year now.
"Very, very sadly, a year on, Anne Sacoolas has still not been sent back here to the UK to face our justice system.
"I please urge you, should you win on November 3 to please reconsider the position the US has taken against us – and when I say us I don't just mean myself and the rest of the parents, I mean us as the UK as well.
"We never, ever expected to be in this position. We never thought the lady who is responsible for taking our son's life would have been able to fly home to the US and evade as best she could the UK justice system."
Describing her family's emotions to Mr Biden, Mrs Charles continued: "It's tearing us apart as a family. We are not only trying to live without Harry every day – the pain now is far worse than it was this time last year because we are no longer numb and no longer in shock.
"So we have to live every day, knowing that Anne Sacoolas is still walking free, tucking her three children into bed at night, doing her everyday jobs and tasks – whilst we're still sat here suffering.
"All we have ever asked of the US and her, is to just allow her to face the UK justice system. It's totally and utterly morally wrong."
Dunn family fight for justice
Dunn family fight for justice
Undated family handout file photo of Harry Dunn. Harry Dunn's mother, Charlotte Charles, has marked the anniversary of her son's death by saying his name is "forever written into history" � and vowed to carry on his family's fight for justice.
Andrea Leadsom MP and Harry Dunn family spokesman Radd Seiger arrive to speak to the media in Brackley, Northamptonshire, where the MP called on Donald Trump to personally intervene to ensure suspect Anne Sacoolas faces trial over teenager Harry Dunn's death a year ago.
File photo dated 09/10/19 of Charlotte Charles, the mother of Harry Dunn, speaking to the media after leaving the Foreign and Commonwealth Office in London, where she met Foreign Secretary Dominic Raab. Harry Dunn's mother, Charlotte Charles, has marked the anniversary of her son's death by saying his name is "forever written into history" � and vowed to carry on his family's fight for justice.
Harry Dunn family spokesman Radd Seiger (left), Harry's mother Charlotte Charles (centre) and her partner Bruce Charles, speak with Andrea Leadsom MP (right) in Brackley, Northamptonshire, where the MP called on Donald Trump to personally intervene to ensure suspect Anne Sacoolas faces trial over teenager Harry Dunn's death a year ago.
File photo dated 20/12/19 of Harry Dunn's mother Charlotte Charles (centre) and stepfather Bruce Charles (left) outside the Ministry Of Justice in London after meeting with the Director of Public Prosecutions. Harry Dunn's mother, Charlotte Charles, has marked the anniversary of her son's death by saying his name is "forever written into history" � and vowed to carry on his family's fight for justice.
File photo dated 15/10/19 of the entrance to RAF Croughton, in Northamptonshire, near where Harry Dunn, 19, died when his motorbike was involved in a head-on collision in August last year. One year on from his death, the family of Harry Dunn continue to fight for justice in a case which has sparked diplomatic tensions between Washington and London.
File photo dated 23/04/20 of US President Donald Trump, who was told to "reconsider its position" on the immunity given to 42-year-old suspect Anne Sacoolas, following a road crash outside a US military base in Northamptonshire which resulted in teenage motorcyclist Harry Dunn's death. One year on from his death, the family of Harry Dunn continue to fight for justice in a case which has sparked diplomatic tensions between Washington and London.
Tim Dunn (far right) and his wife Tracey Dunn (second right), as they gather with friends and family at Portland Bill to scatter his son's ashes in his favourite place in Weymouth, Dorset, a month before the anniversary of his death.
File photo dated 20/12/19 of the family of Harry Dunn (left to right) mother Charlotte Charles, stepfather Bruce Charles, family spokesman Radd Seiger and father Tim Dunn. Harry Dunn's parents have dropped their legal claim against Northamptonshire Police after concluding the force are "absolved of any blame" following their son's death.
Harry Dunn's mother Charlotte Charles arrives at the Foreign and Commonwealth Office in Westminster, London, for a meeting with Foreign Secretary Dominic Raab.
Cardboard cutout of Northampton Town fan Harry Dunn who died in a car crash last August is seen in the stands during the Sky Bet League Two play-off semi final first leg match at the PTS Academy Stadium, Northampton.
Business Secretary Andrea Leadsom and Harry Dunn's mother Charlotte Charles outside South Northamptonshire Council offices in Towcester, after they met following the news that the US have refused to extradite Anne Sacoolas who is charged with causing his death in a road collision outside RAF Croughton in August last year.
A motorbike convoy makes it's way through the village of Charlton after following Harry Dunn's last ride as a tribute to the teenager who died when his motorbike was involved in a head-on collision near RAF Croughton, in Northamptonshire in August.
Charlotte Charles (left), the mother of Harry Dunn, Bruce Charles, and Tracey Dunn speak to media after a motorbike convoy followed Harry Dunn's last ride through Brackley as a tribute to the teenager who died when his motorbike was involved in a head-on collision near RAF Croughton, Northamptonshire, in August.
Chief Constable of Northamptonshire Police, Nick Adderley (centre) and Superintendent Sarah Johnson speaking during a press conference at Northamptonshire Police HQ at Wootton Hall Park, Northampton about the death of Harry Dunn.
Harry Dunn's Auntie Katie Grant (right) and Nicola Watson tie a Green Ribbons which are being made be members of the village of Charlton, Oxfordshire in memory of 19-year-old Harry Dunn who died while out riding his Green motorcycle near RAF Croughton.
Please Drive on Left signs and arrows have been placed on the B4031 road outside RAF Croughton, in Northamptonshire, where Harry Dunn, 19, died when his motorbike was involved in a head-on collision in August.
(Left to right) Bruce Charles and Charlotte Charles (Harry's mother), lawyer Radd Seiger, Tim Dunn (Harry's father) and Tracey Dunn at a press conference at the Parker New York Hotel in New York, US, where Charlotte Charles said that Anne Sacoolas, the American woman suspected of causing her son's death, should be brought back to the UK to face justice.
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Mrs Charles continued: "Justice is so important to us – it doesn't matter what that justice looks like.
"All we ask is for her to face the UK justice system – that's not too much for anyone to ask.
"I know you've lost a son yourself, albeit in different circumstances, but my heart goes out to you because of that.
"Any parent who loses a child never fully recovers – but getting justice can certainly help us on the path to doing so."
Urging Mr Biden to take an interest in the case should he win the election on November 3, Mrs Charles said: "We have many people in the UK who are extremely angry. We've always thought of the US as an ally and that seems to have completely fallen apart since they allowed Anne Sacoolas to return back to the US and walk away from what she's done.
"Although we've had the anomaly amended, and no other family can go through what we've gone through, it still angers many, many people that there are so many US citizens working on UK soil.
"One US citizen has taken the life of my boy and is still not facing the justice system here in the UK for that. Please do your best to amend it."