Max Spiers, a paranormal investigator, who had claimed he was once part of a secret government "supersoldier" project was found dead in Poland this month.
YouTube speculators are convinced he was murdered, despite no official cause of death being given yet.
On Wednesday Express.co.uk reported on the death of fellow UFO researcher Gaurav Tiwari, who was found dead in India under apparently "mysterious" circumstances.
However, it is being treated as a suicide by the authorities.
Conspiracy theorists have long been convinced that UFO chasers who get too close to the truth are bumped off by the secret services or so-called men in black.
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