Australia's most famous murder mystery is SOLVED: Extraordinary twist emerges in baffling 1948 death of man whose body was found on beach with coded note in pocket 
The body of a fully-clothed man was discovered by two trainee jockeys near the shore of Somerton Park Beach, Adelaide, on December 1, 1948. A post-mortem ruled he had died from being poisoned, but the man known only as the 'Somerton Man' was never identified after no one claimed him.
https://www.dailymail.co.uk/news/article-11049863/Somerton-Man-Professor-claims-solved-identity-man-Adelaide-beach-1948.html