A clown with balloons and carnations knocks on a Florida doorstep one May morning — and what's hiding behind the painted smile may be older and hungrier than any killer the regular dicks would ever dare investigate.

THE TRUE CRIME CASE THIS STORY IS BASED ON: On the morning of May 26, 1990, Marlene Warren was eating breakfast with her 21-year-old son Joe at their home in the Aero Club community of Wellington, Florida, when a clown carrying balloons and white carnations rang the doorbell. Marlene answered, remarked on how pretty the gifts were, and was shot in the head at point-blank range. The killer calmly walked back to a waiting white sedan and drove away. Marlene died two days later. She had warned both her son and her mother that if anything ever happened to her, her husband Mike Warren — who co-owned a used car business called Bargain Motors — would be responsible. Mike had an alibi the morning of the shooting, but investigators quickly learned he was having an affair with an employee named Sheila Keen. A novelty shop owner remembered selling a clown costume to a woman matching Keen's description days before the murder, supermarket workers recalled a brunette buying matching balloons and flowers that morning, and the abandoned getaway car contained brown hairs and orange wig fibers — but the forensic science of the era couldn't tie it all together. Mike Warren was arrested four months later on unrelated racketeering and odometer fraud charges and served eight years. After his release, he married Sheila Keen — now bottle-blonde and going by "Debbie" — and the two opened a burger restaurant called the Purple Cow in Tennessee, where Sheila once dressed as a clown for Halloween. The case remained cold for twenty-seven years until a 2014 cold-case grant allowed investigators to retest the evidence using modern DNA technology; a hair recovered from a balloon string matched Sheila Keen. She was arrested on September 26, 2017, and on April 25, 2023, she pleaded guilty in exchange for a 12-year sentence. She was released after serving just 18 months, in November 2024, with Mike still standing by her and insisting on her innocence.
ORIGINAL CASE SOURCES…
https://allthatsinteresting.com/marlene-warren
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Originally aired: April 30, 2026