Two men and a woman who were arrested over the death of a man in toilets in Guildford, Surrey, have been bailed.
Jonathan Heighton, 33, of Guildford, was found unconscious in the toilets at Bedford Road car park on Wednesday.
He was treated by paramedics but pronounced dead on arrival at the Royal Surrey County Hospital.
Two men, aged 22 and 34, and a woman, 39, held on suspicion of administering and supplying a controlled substance, were bailed until 21 October.
Surrey Police said an initial post-mortem examination was inconclusive and they were waiting for the results of toxicology tests which were expected to take at least six weeks.
Detectives have urged any men who used the second-floor toilets between 1430 BST and 1515 BST on 18 August to contact them.
Mr Heighton was wearing a red Liverpool football top, a dark jacket and jeans at the time of his death.