Produced by Sarah Prior and Richard Fetzer Nearly three decades ago, Marlene Warren opened the door of her Wellington, Fla., home and was shot in the face by a clown bearing balloons, flowers and a gun. Joe Ahrens, Warren's son, tells "48 Hours"' Peter Van Sant the clown calmly walked back to a car and drove off. It is a case that rocked the Florida neighborhood where Warren lived at the time and has haunted family members ever since. "I remember that being one of the most terrible days of my life," says Ahrens. "At first we thought maybe it was a balloon popped, but when we saw her fall, we knew something was definitely, seriously wrong," Ahrens says. Also in the home at the time was Ahrens' friend Jeannie Pratt who says the questions she's been asking herself ever since are simple: Who would want Marlene Warren dead. And why? DEADLY DELIVERY Joe Ahrens was 21 years old on that May morning in 1990 when his beloved mother and best friend, Marlene Warren, was shot in the face at her … [Read more...] about Can new DNA tests help police crack the “killer clown” cold case?