The Shocking Story Of Amy Archer-Gilligan: America’s Real-Life Female Serial Killer
Discover the chilling true story of Amy Archer-Gilligan, also known as Sister Theresa, a woman behind one of America’s most disturbing murder cases. Learn about her early life, marriages, crimes, and final days in a mental hospital.
Jul 21, 2025212 Shares105.9K Views
Amy Archer‑Gilligan ran a small nursing home in Windsor, Connecticut, during the early 1900s. At first, she seemed like a caring caretaker for the elderly. However, a surprising number of residents began to die under her watch, far more than usual for such a home. Investigators later uncovered that many of those deaths were caused by poisoning. Her story not only shocked the local community but also inspired the famous play Arsenic and Old Lace.
Early Life
Amy E. Duggan was born on October 31, 1873, in Milton, Connecticut, as the eighth of ten children to James Duggan and Mary Kennedy Duggan. She attended local schools, including Milton School, and later studied at the New Britain Normal School around 1890.
Raised in a large family with nine siblings, Amy grew up in Litchfield County. Early in life, she learned basic education in local town schools, preparing her for future roles in teaching and caregiving.
Marriages
Amy Duggan first married James Archer in 1897. The couple had one daughter born in December that year. Around 1901, they began caring for an elderly widower in Newington, Connecticut. After he passed away in 1904, his heirs converted the home into a boarding house for the elderly. The Archers continued operating it as Sister Amy’s Nursing Home for the Elderly.
James Archer died in 1910 from what was officially called Bright’s disease, a general term for kidney illness. Amy had taken out a life insurance policy on him shortly before his death, allowing her to keep running the nursing home.
In 1913, Amy married Michael W. Gilligan, a wealthy widower who had four adult sons. He reportedly had interest in investing in her nursing home. However, after just three months of marriage, Michael died in February 1914. The official cause was listed as acute bilious attack, referring to severe indigestion. During their short marriage, Michael drew up a will leaving his entire estate to Amy. That will was later found to be a forgery, with handwriting matching Amy’s own.
Murders
Between 1907 and 1917, around 60 residents died at Amy’s Windsor nursing home, with 48 deaths occurring between 1911 and 1916. Initially, families saw this as part of old age, but the unusually high death rate raised suspicions.
One key victim was Franklin R. Andrews, a healthy boarder who suddenly died after a day of gardening on May 29, 1914. His sister found letters showing Amy pressing him for money before his death. Investigators exhumed his body and those of her husband and three other residents. All showed signs of poisoning with arsenic or strychnine.
Evidence showed Amy bought large amounts of arsenic, supposedly to kill rats, and instructed residents to get poison from pharmacies. Prosecutors called the nursing home a “murder factory.”
Amy was arrested in 1917 and originally faced five murder charges, but the case was reduced to one: she was found guilty of killing Franklin Andrews. In June 1917, she was sentenced to death.
That conviction was overturned in 1919, and after a second trial, she pled insanity. She was then sentenced to life in prison, later committed to an asylum until her death in 1962.
Death
Amy Archer-Gilligan, whose full name was Amy E. Duggan Archer-Gilligan, and who was also known by the name Sister Theresa, died on April 23, 1962, at the Connecticut Hospital for the Insanein Middletown, Connecticut. She had been declared insaneand transferred there from prison in 1924.
Amy died at the age of 93from natural causes, mainly due to old age and related health problems. There was no injury or violence at the time of her death. She spent nearly 38 yearsin the mental hospital until she passed away under medical care.
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