Many reports of untimely deaths in the US have been linked to aliens, sparking theories that these individuals may have been murdered by the third kind.

They include a US Air Force pilot who died shortly after claims he witnessed a flying object and a Brazilian man who was 'zapped in the head by an extraterrestrial.'

Nigel Watson, a UFO researcher from Sheffield Hallam University in the UK, has written about the cases in a new book, Death By UFO, which investigates these mysterious deaths.

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