Detectives investigating the murders in Florida of British holidaymakers James Cooper and James Kouzaris have released CCTV footage of their final hours.
The happy tourists were captured on camera in a bar, drinking and talking to other customers.
Mr Cooper, who turned 25 three days before the killings on Saturday April 16, and Mr Kouzaris, 24, were filmed talking to two women for at least 37 minutes in the downtown Sarasota bar.
The 11 stills released by Sarasota Police Department cover a time period from 12.13am to 1.23am.
Police stressed the revellers were not suspects, saying: "The Sarasota Police Department is attempting to determine the activities of the homicide victims on the night of Friday night and early morning Saturday.
"The individuals seen with the victims in the attached photographs are not suspects. We would like to contact these individuals so that we can learn more details about the victims' activities, and other people that may have contacted the victims."
Capt Sutton said the force had a "few leads as a result of the photographs" recovered from one of the dead men's cameras.
Those pictures show Mr Cooper, a tennis coach, sun burnt and beaming at the camera. The other is a close up of Mr Kouzaris, who worked for Northamptonshire County Council.
"We are trying to determine how they got from downtown Sarasota to Carver Court," said Capt Sutton. "We are in a phase where we are in the trenches with long drawn-out stuff."