The story of Ellen Greenberg's death remains one of mystery and controversy. Greenberg, a 27-year-old first-grade teacher from Philadelphia, is found dead in her apartment in January 2011, with 20 stab wounds to her head, neck, and chest. 

For more, join Nancy tonight on Merit Street Media, Dr. Phil's network, at 6 and 9 PM. Check your local listings, or follow Crime Stories with Nancy Grace on your favorite podcast app.