A 40-year-old woman answered her front door one night and faced a clown. The costumed woman, seemingly friendly, let go of her balloons and opened fire, killing Marlene Warren on her doorstep. Marlene's son told police a clown killed his mom and sped off. The murder went cold for 27 years until advancements in DNA uncovered the killer. Get the full story on this episode of Crimes of Passion with Sierra Gillespie, presented by Law&Crime.

Learn more about your ad choices. Visit megaphone.fm/adchoices