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A Massachusetts woman pleaded guilty Thursday to manslaughter in the death of her infant daughter, Baby Jane Doe, found in a gravel pit 37 years ago in northern Maine.

MAINE COLD CASE: MOTHER ARRESTED FOR MURDER OF ‘BABY JANE DOE’ AFTER 36 YEARS

Lee Ann Daigle mug shot

Lee Ann Daigle, 58, pled guilty Thursday to manslaughter in her infant daughter's 1985 killing. (Maine State Police)

Lee Ann Daigle, 58, of Lowell, Massachusetts, was arrested last year after police cracked the case thanks to years of police work and advancements in DNA technology,

MASSACHUSETTS POLICE IDENTIFY REMAINS OF WOMAN SHOT, KILLED IN 1978

Her name was Lee Ann Guerrette when a newborn baby was dragged by a dog to a home in Frenchville and police were alerted to the grisly discovery on Dec. 7, 1985. Detectives tracked the dog’s path to a gravel pit where the baby had been born and abandoned in sub-zero temperatures.

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The death remained a mystery for decades until Daigle's indictment last year on a charge of murder. She’ll be sentenced at a later date in Superior Court.