Updated with info from Transit Police.
Transit Police report a man believed to be in his 50s was hit and killed by a train at the Braintree platform at JFK/UMass.
The man died from his injuries, police say, adding that while an investigation is underway, foul play is not suspected. The Dorchester Reporter reports he jumped.
Extricating the man and investigating the incident halted Red Line service to Braintree; passengers crowded outside stations waiting for shuttle buses; some were able to get on South Shore-bound commuter-rail trains.