The funeral of MI6 code-breaker Gareth Williams will take place on Friday.
The 31-year-old's naked body was found padlocked shut in a holdall in a bath at his London flat on August 23.
Scotland Yard is treating his death as "unexplained".
In a death notice in the North Wales Daily Post, his family announced that the public funeral will take place at 1pm on Friday at the Bethel Chapel, Holyhead, Anglesey.
The notice went on to pay tribute to Mr Williams, saying he was the "beloved" son of Ellen and Ian and the "adored brother and best friend" of sister Ceri and her husband Chris.
The family of Mr Williams, a keen sportsman, has asked for donations to the local Mountain Rescue Service in his memory.