The testimony of Charles H Forgus of Big Springs in Howard County, Texas, is the latest to surface from a person who claims an alien space craft, and not a top-secret US-launched balloon, came down in the desert around the town nearly 70 years ago.
Roswell has been at the heart of the UFO scene since in July 1947 the military sensationally announced in a press release it had found the remains of a crashed flying saucer in the desert nearby.
But the following day it retracted the statement, saying it was in fact a damaged US Air Force air balloon.
Witnesses later came forward to say there had been alien bodies within the "crashed craft", which along with the wreckage were then taken to a mysterious top-secret military base.
There have been claims and counter claims, including that the bodies were crash test dummies and it had been a top-secret balloon spying on the Russians.
All the confusion means it is one of the world's biggest conspiracy theories to this day.
Mr Forgus' account is revealed in the new book UFOs Today: 70 Years of Lies, Disinformation and Government Cover-Up by Dr Irena Scott, which is published by Flying Disk Press tomorrow, June 1.
He was interviewed, aged 81, in 1999, but the account appears to have lain buried until now, due to copyright issues according to Flying Disk Press publisher Phillip Mantle.
Mr Forgus claimed to have been driving with an unnamed sheriff on the night of the alleged crash in July 1947, from Texas to Roswell to pick up a prisoner, when details of the incident "came over on the police radio".
He was interviewed in 1999 by Los Angeles private investigator Deanna Bever, who was looking into Roswell, and another interviewer whose initials are only given as LR.
Dr Scott said in the book: "Unlike other eyewitness accounts where few people actually reported seeing bodies, this witness reported seeing the craft and the bodies in a crash that appeared significant enough to report."
He told of a perfectly round saucer being crashed in a canyon, after it appeared to have hit a "side wall".
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