One conspiracy theorist was found dead on a sofa in Poland. In a few days, he had been scheduled to talk about conspiracy theories as well as UFOs at a meeting.

Max Spiers had left a disturbing text to his mother, Vaness Bates, 63. He had written: "Your boy's in trouble. If anything happens to me, investigate," just a few days before he died.

It was said that he had died from "natural causes," even though no post-mortem had been conducted. Still, due to his involvement in UFOs, it is possible that he had made enemies who had done away with him.

Though he was from Canterbury, UK, he was in the US for a few years. He came back to visit his mother for a while, but then set off for Poland.

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."

He was probing deeply into the mysterious and suspicious world behind UFO sightings as well as the conspiracies behind them. Recently, even celebrities in politics, business and entertainment were also being examined.

The 39-year-old was the father of two boys. A number of followers seem to be convinced that he was killed by government agents, by the secret services or "men in black." This is what has happened to many seekers who probe too deeply into suspicious circumstances, they believe. 

Vanessa arranged for his body to be flown home one week following his death. After that, he was buried in a cemetery in his home.

But even now, two months after his death, though a post-mortem examination has been done by a pathologist in east Kent,  Vanessa says she cannot be certain about the result, or if there will be an inquest or not.

Vanessa, said: "Max was a very fit man who was in good health and yet he apparently just died suddenly on a sofa. All I have is a death certificate from the Polish authorities that it was from natural causes, but no post-mortem was done so how can they tell that? They are also refusing to release any paperwork about it to me because, absurdly, I don't have his written permission."

She added: "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. He has a brother, Josh, and sister, Becky, who are both devastated, as are his two boys. We all want answers to this and I will continue to fight to get to the truth."

All the conspiracy theorists are suspicious. On Project Camelot website, a blogger wrote: "The entire circumstances are suspicious and I urge everyone to encourage the release of details about what really happened and call for an autopsy."

Another seeker, Craig Hewlett, added: "If it wasn't true what he talks about then why would they kill him? Healthy people don't just get sick and die, they get poisoned ."

The North East Kent coroner's office has reported that the death was at the "very early" stages of investigation.