The attempt to put pieces of his death together sparked a worldwide search to trace his identity after he was found dead near Dovestone Reservoir in Oldham, Greater Manchester
A toxicology reports has confirmed the circumstances surrounding the death of a mystery man who was found dead on Saddleworth Moor just 24 hours after catching a train from London.
The mystery man aged between 65 and 75, bought one-way ticket from Ealing Broadway to Euston on December 11, 2016.
Speculations concerning his death ranged from him being a victim of a 1949 air crash at the site, to the moor having some sort of meaning to him.
The poison, a white powder which is highly toxic, is a pesticide used to kill rodents and birds and is usually inhaled, injected or taken orally.
There appears to be a mystery concerning his death. Detective Sergeant John Coleman, said that while the toxicology report had revealed the cause of the man's death, it is still unknown as to why and how he ended up on Saddleworth Moor.
One previous explanation was that the man was a survivor of the 1949 plane crash on the moor -which claimed 24 lives - and had returned to the scene of the tragedy to take his own life.
More investigations are going on. With the help of the public, the police has hopes it would get ahead of the mystery in good time.