Police have released pictures of a man they want to trace in connection with the death of a pedestrian in a car crash in Hertfordshire.
Ricky Burlton, 20, from Enfield, died in the crash early on 4 June on the A10 exit slip road at Hoddesdon.
Police said the car was being driven by an Albanian who called himself Georgios Tsoulos, of Woodlands Road, Hertford, but police say this name was false.
He is wanted for failing to stop at the scene of a collision.
A white Rover car, involved in the collision, has been recovered as part of the investigation.
Inspector Paul Davis said the injuries to 'Mr Tsoulos' were very distinctive.
He said: "He has stitches running from the bridge of his nose above and across his right eyebrow and smaller cuts, which also needed stitches, on his right cheekbone and right side of his nose.
"We are carrying out extensive lines of inquiry but we have taken the unprecedented step of releasing a photo showing his injuries to help in our appeals to trace him."
Anyone with information about his whereabouts is asked to call 999 giving his location.
The family of Ricky Burlton earlier paid tribute to a "selfless, helpful, brave, courageous and sensitive" man.
His mother Dawn said: "Ricky was the type of person whose smile would light up a room; he had the ability to detect if someone was unhappy or feeling low and through his warmth he was able to cheer them up and change their mood.
"He never asked for anything from anyone he was one of the few people that seemed to live to help others, he never saw giving up his time as a problem as he loved being busy."
His family also urged anyone with information about the incident to come forward.