Police in North Haven said they're investigating the death of a 23-year-old man.
They said they man, who was a passenger in a vehicle, suffered some kind of medical emergency just before 5 p.m. on Tuesday.
The vehicle was at the intersection of Hartford Turnpike and School Lane when emergency crews responded.
Police said the man did not respond to life-saving efforts.
He was transported to a local hospital for treatment; however, he was later pronounced dead by a medical professional.
The cause of death remains unknown.
Police said it's being investigated by their Investigative Services Division.
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