Was Bigfoot Killed in Mt St Helens Eruption? You are here: Home ➜ Was Bigfoot Killed in Mt St Helens Eruption? Ryan on May 18, 1980 Following the May 18th, 1980 volcanic eruption of Mt St Helens, several reports of the Government disposing of dead Bigfoot. Bigfoot Bodies Removed After 1980 Mt. St. Helens Eruption