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A British conspiracy theorist found dead in a flat in Poland texted his mother asking her to investigate “if anything happens to me" days before his body was discovered.

Max Spiers, 39, was found dead on a sofa in an apartment in Warsaw, Poland, where he was due to give a talk about UFOs and other conspiracy theories.

Friends claimed he died after he “vomited a black liquid” and supporters have called for an inquiry into his death.

The father-of-two, from Canterbury, was ruled to have died from natural causes though his mother claims no post-mortem examination has been carried out on his body.

Days before his body was discovered Mr Spiers' mother Vanessa, 63, received a text which read: “'Your boy's in trouble. If anything happens to me, investigate."

Mr Spiers was working with science fiction writer Madlen Namro and Monika Duval who he was visiting at the time of his death.

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.”

In one of his final social media messages he wrote: 'I'm good, I am just wayyyyyy too tired.'

Max made his living out of investigating UFO sightings and alleged cover-ups.

Recently he was said to be looking into the lives of well-known figures in the worlds of politics, business and entertainment.

His mother believes theories about his death may be true. She 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 that is was from natural causes, but no post-mortem was done so how can they tell that?"

Blogger Project Camelot 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.”

A message on the conspiracy theory website Bases Project reads: “Max was a good friend to many of us and he will be greatly missed, please show your respects for him by refraining from gossip and allowing his family and close friends to deal with their loss in peace. RIP Max Spiers.”

Last week a fund was set up to pay for a memorial service to him. Well-wishers aim to raise £3,000.

The fund, set up on behalf of Mr Spiers' mother Vanessa Bates is to pay for a memorial and headstone for him at a church in Canterbury.

A statement on the fundraising page read: "Max was loved and will be missed by many.

"Although Max has already been buried they are still in mourning and have no closure at this time as the circumstances of Max's passing is still not clear.