Authorities are investigating the death of a man in Boston police custody earlier this month.
The Suffolk County District Attorney's Office confirmed Thursday night that John Campbell, a 45-year-old Revere man, was found unresponsive in his cell on Sept. 7. He was taken to a hospital and pronounced dead.
Boston police said Campbell had been arrested the previous day on a charge of assault with a dangerous weapon. The case allegedly involved a knife.
According to the DA's office, an investigation by the medical examiner found no signs of physical trauma.
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The cause of death is not known, but toxicology screenings are underway.
No further information was immediately available.