Mystery behind evil dadâs horror note Jack, 15, and Jennifer, 13, were killed by their father at their West Pennant Hills home on July 5, 2018. Crime by Lane Sainty 12th Apr 2021 5:12 AM There are not many mysteries left when it comes to what happened to Jack and Jennifer Edwards. We know too much about the lives of these Sydney teenagers, the violence they suffered at the hands of their father, and the institutions that failed to protect them before he gunned them down in their own home. We know too about the extraordinary grief of their mother Olga, who took her own life in the house where her children died five months later, unable or unwilling to go on without them.