You may be looking for Matt Strevens.

Matt Stevens was a young man who frequently visited Nightspot, a Cardiff nightclub. In 2007, he was seduced by Carys Fletcher, unaware that she had been possessed by the Sex Gas. They had sex, and at the point of orgasm, Matt's body exploded into dust, killing him at approximately 3:07 in the morning. An only child, Matt was survived by his parents. (TV: Day One)

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