Suffolk District Attorney Daniel F. Conley’s office is investigating the death of a 53-year-old Somerville woman who fell off a boat early today near Piers Park in East Boston.

Boston police said they were alerted to a person drowning in the waters off 256 Marginal St. around 4:43 a.m. today.

The woman’s body was recovered around 5:20 a.m. and her death was brought to the attention of law enforcement by her husband, according to Conley’s office.

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Authorities said the woman had been living with her husband in their boat for the summer. She fell into the water this morning and her husband dived in to rescue her. After performing CPR unsuccessfully, he called 911, said Conley’s spokesman Jake Wark in a statement.

An external examination did not reveal any signs of physical trauma, but an autopsy will reveal the cause and manner of the woman’s death, the statement said.

The husband was transported to Massachusetts General Hospital for observation and treatment and is expected to survive, the statement said. Authorities are not releasing her name.

State Police detectives assigned to Conley’s office are now investigating the woman’s death because her body was found at Piers Park, a Massport-owned property on the East Boston waterfront, prosecutors said.