Police are preparing a file for prosecutors to consider whether to charge a man arrested on suspicion of murdering a guest at Michael Barrymore's home in 2001.
Stuart Lubbock, 31, died after being found unconscious in the TV presenter's pool in Roydon, Essex.
A man, in his 50s, was released under investigation in March.
Essex Police said a file would be submitted "imminently" to the Crown Prosecution Service (CPS).
The man, who has not been named, was arrested in Cheshire on suspicion of indecent assault as well as on suspicion of murder after "significant new information" emerged, the force said.
Mr Lubbock, a butcher from Harlow, was at a party with eight other people at Mr Barrymore's home on 31 March 2001 when he died.
A post-mortem examination showed he suffered severe internal injuries which suggested he had been sexually assaulted.
A spokesman for the force said: "Following our substantial and detailed investigation, we will imminently be submitting a file to the CPS for their consideration and decision."