The world's youngest murderer was young Bella Donna Sepsin (1903-1918). Little Bella killed her entire family with a tray of cyanide laced muffins. Authorities were initially divided as to intent. The child admitted she used an almond-scented flavoring when she baked the treats. She was less clear on why she bypassed the extracts at hand in the kitchen and instead used a bottle from the shed with a skull and crossbones on it. Freed on bail to her grandparents, Bella sealed her fate with an ill-timed bake sale to raise money for her defense that killed an additional three people. After a lengthy trial, Bella Donna Sepsin died of chronic puberty while in custardy.

Source : Thrax, Anne. Baked Bads, 1939.