Bela Kiss was a successful tinsmith who, after his second wife ran away with a younger lover, picked up a very interesting hobby. Fortunately, the start of World War 1 (maybe?) but a stop to it. 

Sources:

Bela Kiss. Wikipedia. Last accessed on September 1, 2020. https://en.wikipedia.org/wiki/B%C3%A9la_Kiss

Cioppa, Deanna. The Terrifying Story Of Bela Kiss, Hungary's Most Murderous Bachelor. Mental Floss. August 30, 2018. https://www.mentalfloss.com/article/555244/terrifying-story-bela-kiss-hungarys-most-murderous-bachelor

Max. Bela Kiss — He Pickled His Victims Starting with his Wife and Her Lover! WickedWe. Last accessed on September 1, 2020. https://wickedwe.com/bela-kiss/