A former Royal Marine charged with assisting the Hong Kong intelligence service has been found dead, police say.
Matthew Trickett, 37, a Home Office immigration officer, appeared in court charged under the National Security Act last week.
He was found by a member of the public in a park in Maidenhead, Berkshire on Sunday, Thames Valley Police said.
His death is being treated as unexplained and a post-mortem examination will be carried out in due course, the force added.
Officers attended Grenfell Park in Maidenhead at around 17:15 BST on Sunday, where Mr Trickett was found.
He was given emergency treatment but was pronounced dead at the scene.
A black forensics tent could be seen inside a cordoned off area in the centre of the park on Tuesday evening. Police officers were also stationed around the park.
Detectives are asking for anyone who was in the park on Sunday afternoon to come forward if they have any information.
The force has referred itself to the Independent Office for Police Conduct because it was in contact with Mr Trickett as he was on bail at the time and had to regularly report to a police station.
In a statement, Mr Trickett’s family said they were “mourning the loss of a much-loved son, brother, and family member.”
“We would be grateful if the press would respect our privacy at this difficult time and refrain from intruding on our grief,” they added.
His solicitor, Julian Hayes, said: “we are naturally shocked at this news and supporting his family as best as we can”.
Mr Trickett was a Home Office immigration officer, who had previously served as a Royal Marine for six years. He was also the director of a security firm called MTR Consultancy.
Last week, he was charged along with Chi Leung (Peter) Wai, 38, and Chung Biu Yuen, 63, under the National Security Act with assisting the Hong Kong intelligence service and foreign interference.
Between 20 December 2023 and 2 May, they are accused of agreeing to undertake information gathering, surveillance and acts of deception that were likely to materially assist a foreign intelligence service.
