British prosecutors are seeking the extradition of Anne Sacoolas over the crash last August in which Dunn was killed while riding his motorbike.

Sacoolas, 42, was given diplomatic immunity and left Britain shortly after the accident. Her lawyer has said that she would not return voluntarily to Britain to possibly face jail for "a terrible but unintentional accident."

(Reporting by Alistair Smout; Editing by Sandra Maler)