The story of the man[1] whose body was used to fool German intelligence during Operation Mincemeat is quite tragic:

> Michael was born in Aberbargoed in Monmouthshire in South Wales. Before leaving the town, he held part-time jobs as a gardener and labourer. His father Thomas, a coal miner, killed himself when Michael was 15, and his mother died when he was 31. Homeless, friendless, depressed, and with no money, Michael drifted to London where he lived on the streets.

> Michael was found in an abandoned warehouse close to King's Cross, seriously ill from ingesting rat poison that contained phosphorus. Two days later, he died at age 36 in St Pancras Hospital. His death may have been suicide, although he might have simply been hungry, as the poison he ingested was a paste smeared on bread crusts to attract rats.

> After being ingested, phosphide reacts with hydrochloric acid in the stomach, generating phosphine, a highly toxic gas. One of the symptoms of phosphine poisoning is pulmonary oedema, an accumulation of large amounts of liquid in the lungs, which would satisfy the need for a body that appeared to have died by drowning. Purchase explained, "This dose was not sufficient to kill him outright, and its only effect was to so impair the functioning of the liver that he died a little time afterwards". When Purchase obtained Michael's body, it was identified as being in suitable condition for a man who would appear to have floated ashore several days after having died at sea by hypothermia and drowning.

[1] https://en.wikipedia.org/wiki/William_Martin_(Royal_Marines_...