Matthew Trickett, 37, who was charged with surveillance of activists, was found on Sunday evening in Maidenhead park

A former Royal Marine commando who was charged with spying for the Hong Kong intelligence service has died, police have said.

Matthew Trickett, 37, who was on bail, was found by a member of the public in a park near where he lived in Maidenhead, Berkshire.

Thames Valley police said officers attended and administered emergency treatment but he was pronounced dead at the scene in Grenfell Park on Sunday. The force said: “An investigation is ongoing into the death, which is currently being treated as unexplained.”

Trickett appeared in court along with two other men last week accused of monitoring, surveillance and harassment of pro-democracy activists in the UK.