Police are investigating the death of a 4-month-old boy who was found unresponsive in his family's apartment in Chelsea.
The Suffolk County district attorney's office says a family member discovered the child in the Washington Avenue apartment around noon Monday.
He was taken to Whidden Memorial Hospital in Everett, where he was pronounced dead.
Authorities say a preliminary examination of the child's body didn't reveal any immediate signs of violent trauma.
The medical examiner will conduct an autopsy to determine the cause of death.
Authorities say there is no evidence of foul play but that the investigation is ongoing.