In the early 1900s, on a small farm in La Porte, Indiana, Norwegian immigrant Belle Gunness used strychnine to poison her boyfriends before feeding their remains to the hogs.Gunness's motive was to collect life insurance, cash and other valuables from her victims.In New Orleans during the early 19th century, French socialite Delphine La Laurie beat, tortured, and performed medical experiments on slaves in the basement of her mansion.In the state of Washington, Linda Burfield Hazzard, a quack doctor and a self-proclaimed "fasting specialist", believed she could heal her patients through exhausting diets and starvation.During the 1880s in Liverpool, England, sisters Catherine Flannigan & Margaret Higgins poisoned their family members in an attempt to claim insurance payouts.
According to legend, Báthory murdered as many as 650 young women, because she believed that drinking their blood would preserve her youth.
She was the last woman to be executed in the United Kingdom.
The Lainz Angels of Death murdered at least 38 of their patients between 19 by morphine overdose or by forcing water down their lungs.
Both women pleaded guilty and were sentenced to 24 years in prison. Petersburg, Florida, Dudley (a registered nurse with Münchausen syndrome by proxy) murdered twelve nursing home residents by overdosing them with insulin injections.
Sylvia Seegrist – Driven by a rage from untreated schizophrenia, Sylvia Seegrist opened fire on innocent shoppers in a Philadelphia-area mall in 1985. In 1997, in Sherwood, Arkansas, Christina Marie Riggs smothered her own children in 1997 and attempted suicide afterwards. She was found guilty of second degree murder and was sentenced to 65 years in prison, but died in prison during her sentence.