This was in a UK tabloid so it's anyones guess how accurate ( or not ) this story could be.
Dad of two Max Spiers was found dead on a sofa days before he was meant to give a talk about conspiracy theories and UFOs.Just days before his death the extra-terrestrial expert sent a chilling text message to his mum Vanessa Bates, saying: "Your boy's in trouble. If anything happens to me, investigate."
Vanessa, 63, said: "Apparently, he had not suffered any obvious physical injuries but he could have been slowly poisoned, which is why the results of toxicology tests from his post-mortem are so important."
Vanessa said: "He was making a name for himself in the world of conspiracy theorists and had been invited to speak at a conference in Poland in July.
"He was staying with a woman who he had not known for long and she told me how she found him dead on the sofa.
"But I think Max had been digging in some dark places and I fear that somebody wanted him dead."
Max made a career out of investigating UFO sightings and alleged cover-ups.
More recently, he was said to be probing into the lives of well-known figures in politics, business and entertainment.
http://www.mirror.co.uk/news/uk-news/ufo-hunter-found-dead-mysterious-9060045
It would be worth following up. It is possible it was a recreational drug overdose. You need to wait for the inquest really.