Cameron has reportedly also told Opposition Labour party MP Stella Creasy that he would speak to Prime Minister Narendra Modi in reference to the case of Aman Vyas, who is now living in New Delhi.
In a letter to Creasy, Cameron said his government will "do everything possible to secure the swift return of Mr Vyas, so that he may stand trial for the crimes he is accused of", the 'Evening Standard' reports.
Scotland Yard believes 31-year-old Vyas may be involved in a string of late-night attacks in north-east London over five years ago.
The CPS has also authorised charges againstVyasover three allegations of rapes in the two months before Samaraweera's murder and the Metropolitan Police are investigating whether he is responsible for five other sex attacks.
"Officers are working with the Indian authorities," the Met Police said.
Vyas was on a student visa in Britain when the alleged attacks took place.
He was granted bail in November 2011.
Campaigners and Samaraweera's family members are now planning a protest outside the Indian High Commission in London on June 1 to demand progress.
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