Katherine Ann Hruby was 17 and a high school junior and volleyball player when she was found shot to death in her family’s Duncan, Oklahoma home. The bodies of her parents, 50-year-old John Hruby and 48-year-old Joy Tinker Hruby, were discovered with her; a housekeeper found them on Monday, October 13, 2014, and investigators believe the killings occurred on Thursday, October 9. The Hrubys were a prominent local family—John published The Marlow Review—which made the violence especially shocking to the community.

Investigators identified a person of interest close to the family and arrested Katherine’s then 19-year-old brother, Alan Hruby, a University of Oklahoma student. According to his confession, the killings were premeditated: he shot his mother first, then shot Katherine when she arrived, and shot his father when he returned home. After the murders he traveled to Dallas for the weekend to attend a football game.

Anyone who knew the Hruby family or has information about the days leading up to October 9, 2014, is asked to come forward.