Police say they found a 24-year-old man dead on an A train in Brooklyn late last night.

According to cops, officers were alerted to an unconscious man on a southbound A train at the Jay Street station at around 8:30 p.m. last night. Investigating officers found the 24-year-old man near the front of the train, unconscious and unresponsive, with no signs of trauma. Emergency responders took the man to from the train to Brooklyn Hospital, where he was pronounced dead.

Brendan Sullivan, a witness who was on the train, tells us that the man was unresponsive after the train left 14th Street. Passengers "thought he was asleep and tried to wake him up after 14th Street. They didn't want him to miss his stop." According to Sullivan, the man turned blue when the train pulled into Jay Street.

"One person said there were liquor bottles around him, but another said he turned purple from a seizure. It was a packed train and it got fuller as police entered the station," Sullivan told us. "People remained in the first car as police tried to resuscitate him." Sullivan said he didn't personally witness the man drinking.

Police are still investigating the incident, and the man's identity is being withheld pending family notification. A police source told Gothamist that the man had a history of alcohol abuse, and had recently been admitted to Bellevue Hospital for alcohol withdrawal symptoms.