Polish school boy Karol Kot, known as the Vampire of Krokow had killed two people, an 11yearold boy and an 86yearold women. He tried to kill many more in arson and poison attempts. He was executed by the age of 21. Make sure you subscribe to get your regular crime fix: From Worlds Most Evil Killers Content licensed from Keshet to Little Dot Studios. Any queries, please contact us at: