Conspiracy theorist vomited two litres of black fluid before dying

UFO conspiracy theorist Max Spiers was found dead in Poland. Photo / Facebook

A conspiracy theorist who died while trying to expose government cover-ups vomited two litres of black fluid before collapsing, a British inquest has been told this week.

The Mirror reports Max Spiers, 39, visited Poland to speak at a conference before he died on a sofa 24 hours later.

Days before his death on July 16, the father-of-two sent a chilling text message to his mother, Vanessa Bates, saying: "Your boy's in trouble. If anything happens, investigate."

The inquest into his death, at Canterbury coroner's court, was told a post-mortem examination was unable to determine how he died.

Polish authorities had previously dismissed his death as being down to natural causes - despite no initial post-mortem examination.

A world renowned conspiracy theorist from Canterbury in the UK, Spiers was a former classmate of Orlando Bloom.

He lived in the United States for a few years, but had returned to the city to stay with his mother, before jetting off to Poland.

Spiers had visited Poland after holidaying in Cyprus with a friend, who later discovered his body.

In a statement, coroner's investigations officer Caroline O'Donnell said: "When they returned, Mr Spiers became ill with a high temperature and was weak," the Mirror reported.

"The following day, Mr Spiers vomited two litres of black fluid.

"The friend called a doctor who attempted resuscitation before pronouncing him dead."

Ms Bates previously said her son had been making a name for himself in the world of conspiracy theorists.

"But I think Max had been digging in some dark places and I fear that somebody wanted him dead," she said.

Coroner Alan Blunsdon told the court he was still awaiting a report from Polish authorities.

He also hopes to secure funding to have Mr Spiers' laptop and mobile phone forensically analysed.

The inquest continues.