A man is expected to be charged with manslaughter following an arrest, police in Thailand said.
Police said British tourist Stephen Ashton was with a group of friends and 300 other tourists on New Year's Eve.
They were celebrating the countdown to 2013 at a pub and restaurant called the Zoom Bar when he was shot by a home-made gun at Haad Rin beach shortly after 4am.
The Bangkok Post reported that he was visiting the island with four or five friends and was staying at Pink Bungalow on Haad Rin.
More top news
Since Friday's EU result, the Liberal Democrats have recorded thousands of voters signing up to become members.
Anthony Joshua vowed to rest after retaining his heavyweight title.
Adele described performing at Glastonbury as the "best moment" of her life as she took to the Pyramid Stage.