Marc Richardson

Three members of the Richardson family were murdered in Medicine Hat, Alberta, Canada in April 2006. The murders were planned and committed by the family's 12-year-old daughter Jasmine Richardson and her 23-year-old boyfriend Jeremy Steinke, now going by the name Jackson May. Richardson and Steinke were each convicted on three counts of first-degree murder. Richardson, who had turned 13 before being convicted, is thought to be the youngest person in Canada ever convicted of multiple first-degree murder counts. Her 10-year sentence was completed on May 6, 2016.

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