LISBON FALLS – A Lisbon Falls woman was charged Wednesday in the death of her 22-month-old adopted son.

Sarah Allen, 29, was arrested on a charge of manslaughter in the death of her adopted son, Nathaniel, whom she and her husband had adopted from Guatemala last April, investigators said.

Nathaniel died at the Maine Medical Center on Feb. 15, a day after police and an ambulance were summoned after a 911 call that indicated the boy, the couple’s only child, was not breathing.

The boy died from head injuries as a result of being violently shaken, investigators said.