The home secretary has been asked to consider a “virtual trial” for Harry Dunn death suspect Anne Sacoolas.
The American was charged with causing death by dangerous driving after a crash in August last year which resulted in the 19-year-old’s death.
The 42-year-old claimed diplomatic immunity following the collision outside RAF Croughton in Northamptonshire.
She was able to return to her home country, sparking controversy.
The Dunn family’s constituency MP Andrea Leadsom has written to ministers, including Priti Patel, “asking that they seek a virtual trial of Ms Sacoolas”.
The MP said: “A traumatised family are still waiting for a trial that will give them closure.”
Ms Leadsom said a virtual trial would allow the US government to “avoid giving the waiver of diplomatic immunity” and should any custodial sentence be handed down it “could likewise be undertaken in the United States”.
“Harry’s family are not vengeful – but like every citizen they believe in right and wrong,” Ms Leadsom added.
She also wrote to the Solicitor General, the foreign secretary, the Crown Prosecution Service and the Lord Chancellor to put forward the idea.
Mr Dunn’s family said their “final goodbye” to their son last month as they scattered his ashes in his favourite place – Portland Bill, near Weymouth in Dorset.
Reacting to the letters, Mr Dunn’s mother Charlotte Charles, said: “For me and my family, it is all about doing the right thing and ensuring justice is done.”
The Home Office said it was a matter for the Attorney General’s Office which confirmed a letter had been received but declined to comment further.
A Home Office extradition request was refused by US secretary of state Mike Pompeo in January.