Jennifer Petelczyc, 59, and her youngest daughter Gretl, 18, were senselessly murdered on Friday after becoming the unsuspecting victims in the marriage breakdown of a family friend which ended in a gunman storming their house. Jennifer Petelczyc, 59, and her youngest daughter Gretl, 18, were senselessly murdered on Friday after becoming the unsuspecting victims in the marriage breakdown of a family friend which ended in a gunman storming their house. National / WA Sydney Morning Herald – Latest News