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The air ambulance landed near Strood railway station after a man collapsed this morning.
Paramedics worked on the man, believed to be in his 40s, for an hour but he was pronounced dead at about 11.20am.
It is thought he may have suffered a heart attack.
Police and members of the South East Coast Ambulance Service attended.
British Transport Police have taken over the investigation but are not believed to be treating the death as suspicious.