Mary Bell, 11-Year-Old Serial Killer, Scotswood, England, 1968 - Murdered Martin Brown (age 4) on May 25, 1968 and Brian Howe (age 3) on July 31, 1968. Her best friend Norma Bell, 13, (not related) took part in the 2nd murder. Mary attempted many murders besides those. Quotes: “I like hurting people.” - “Brian Howe had no mother, so he won’t be missed.” - “Murder isn’t that bad, we all die anyway." <3