The UK has officially asked Georgia to extradite Jack Shepherd, who was convicted of killing Charlotte Brown during a speedboat trip in 2015.
The 31-year-old is currently in prison in Tbilisi.
A spokesperson for the Crown Prosecution Service said the organisation prepared a request for extradition which was sent to Georgian authorities by the Home Office.
It remains unclear when the request was officially submitted.
The web designer took Ms Brown on a speedboat in the Thames during their first date in December 2015.
Ms Brown was killed when the boat overturned, plunging the pair into icy water.
Shepherd then went on the run for 10 months but was convicted of manslaughter in absentia and sentenced to six years in prison.
He handed himself in to Georgian police officers in January 2019.
Shepherd has reportedly written to Ms Brown's family, requesting a meeting "to explain everything that happened that tragic evening".
The note, obtained by The Sun newspaper, read: "I want more than anything to talk to Charlotte's family.
"I wish that I had ignored the police and lawyers and spoken to you three years ago."
But Ms Brown's father Graham Brown is quoted by the newspaper as saying: "We don't intend to dignify Shepherd's comments with a response until the extradition process has been completed and he is finally held accountable for his actions."
Additional reporting by agencies
