The balloons that the clown carried were only sold at a Publix at Community and Military Trail, near Sheila Keen's home, according to the investigators.
Sheila Keen Warren-who married Marlene's husband 12 years after her death-was arrested on Tuesday almost three decades after she allegedly donned an orange wig and murdered her rival on the steps of her own home.
Officers said in 1990, Sheila dressed as a clown, carrying balloons and flowers to Marlene Warren's door before shooting her point blank in the face.
On May 26, 1990, Marlene Warren answered a knock on the door at her home in Palm Beach County, Florida.
Virginia police have arrested Sheila Keen Warren in connection to the 1990 murder of Marlene Warren.
"Any murder's horrific. It doesn't matter whether you're wearing a clown costume or not", Palm Beach County sheriff's Sgt. Richard McAfee said at a news conference.
"It was also learned that Sheila Keen had married Michael Warren, Marlene Warren's husband, in 2002", police said in the statement.
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A grand jury issued a first-degree murder indictment of Sheila Keen Warren Aug. 31.
Within a year after the murder, detectives focused on Michael Warren and Shelia Keen, a Wellington resident who ran a vehicle repossession business with her estranged husband, Richard. But there was never enough evidence to charge her until DNA evidence could be retested recently with new technology.
'We're more than glad to be able to help to bring this to a successful conclusion'.
Police learned four months after the shooting he was having an affair with a Sheila Keen. She was taken to jail in Washington County where she was being held awaiting extradition to Palm Beach County, Florida.
But then the clown shot the woman in the face before walking to a white convertible and driving away. Marlene died two days later from her gun wounds.
In 2000, as DNA testing became more common, the Palm Beach sheriff's office hoped the orange fibers and brown hair found in the LeBaron would lead them to Marlene Warren's killer.
At a nearby costume shop, salespeople identified Sheila as the woman who bought a clown costume few days before the shooting. Michael served three years in prison for odometer tampering, grand theft and racketeering before being released in 1997.