Police have released video of the last movements of a Bath student who died after being found with head injuries at a bus stop.
They hope releasing the CCTV footage will help solve the mystery of how 22-year-old Alex Green was injured.
The University of Bath economics student was discovered on Westmoreland Road in Bath in the early hours of 30 September, after walking home from The Second Bridge nightclub.
He was taken to the city's Royal United Hospital before being transferred to Southmead Hospital in Bristol.
He died three days later of internal head injuries.
The video shows his last movements on the morning of Saturday 30 September:
:: 3.40am: Footage shows Alex leaving the city centre along Dorchester Street, by the city's train station and main bus station
:: 3.41am: He's caught on camera walking past the Esso garage on the A36 Lower Bristol Road
:: 3.42am: Alex walks past the Green Park Tavern into Westmoreland Road – this is the last sighting of him
:: 3.46am: There is no sign of Alex on footage taken from the U1 First Bus, which turns into Westmoreland Road, and he is not at the bus stop
:: Between 3.46am and 3.49am: A group of five people turn into Westmoreland Road and find Alex lying on the ground near the bus stop
:: 3.49am: An ambulance is called
Police investigating his death said they are currently looking into three main scenarios – whether Mr Green was injured in a fall, was involved in a road traffic collision or was assaulted.
Detective Inspector Dom Graham, who is leading the investigation, said his death is being treated as "unexplained" and appealed for the public's help.
"We're hoping the release of more footage which shows Alex's last known movements will help jog people's memories and encourage witnesses to come forward," he said.
The police appealed for anybody who saw Mr Green in the Second Bridge nightclub on the night of September 29 or morning of September 30 to contact them.
They are also hoping to hear from people who walked or drove through Westmoreland Road between 3.30 and 4am, or anyone who saw or heard anything suspicious around that time.
They also want to speak anybody on the U1 First Bus which turned into Westmoreland Road at 3.46am, including a group of students who got off at the next stop in Lower Oldfield Park.