In recent months the deaths of famous UFO hunters Max Spiers and Guarav Tiwari have prompted many to ask if someone is killing off our extra-terrestrial investigators.
But mysterious cases involving Ufologists are nothing new, and sometimes, instead of turning up dead, these people simply vanish.
Bruno Borges is one example. The Brazilian psychology student who was interested in extra-terrestrials and the Illuminati vanished earlier this year.
Frederick Valentich was a UFO enthusiast and a pilot; which sounds like the perfect combination for anyone wanting to investigate strange flashing lights in the sky.
Strange Mysteries covers these cases and more in this fascinating video.