Before 1868 Swanenberg lost two young daughters. She married Johannes van der Linden on May 13th, 1868. This union was blessed with seven children (five boys, two girls) and lasted until 1886.
She earned the nickname "Goeie Mie" ("Goede Mie" in modern Dutch) by taking care of the sick.
Between 1880 and 1883 Maria poisoned approximately one hundred people with arsenic. Twenty-seven people died from the poisoning, an additional forty-five suffered from long term health problems as a result.
Her first victim was her own mother. After a while she also killed her father.
In 1883, while she was in the process of poisoning an entire family, she was caught. Her trial began on April 23rd, 1885.
The motive for the killings was insurance policies and inheritances -- most of the policies she took out herself.
She was sentenced to life in a correctional facility and died there in 1915 at the age of 75.