Among Florida’s cold cases, the killer clown was one of the most intriguing. Cops say back in 1990, a woman drove up to Marlene Warren's home carrying balloons and a bouquet of flowers. When she opened the door, the clown pulled out a gun and shot her in the face. The late Marlene Warren liked clowns when she was a little girl. No one was arrested for the 27-year-old crime until recently.