Police issued an arrest warrant for Sheila Warren in August and tracked her to Blue Ridge Mountains home in Virginia, where she was arrested on Tuesday.
The Palm Beach County Sheriff's Office says Keen, the mistress of the victim's husband, was a suspect early on, but there was never enough evidence to charge her.
Without saying a word, the clown pulled out a gun and shot Marlene Warren in the face. Sources told detectives within months of Marlene Warren's murder that Sheila Keen was having an affair with Marlene's husband, Michael Warren, for whom she worked.
"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 Tuesday.
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Authorities also learned that Sheila Keen married Michael Warren, Marlene Warren's husband, in 2002. The two were reportedly running a restaurant together in Tennessee when Sheila was arrested.
Sheila Keen Warren was identified as the gift-bearing clown that haunted a decades-old cold case probing the woman's death at her Wellington home.
At the time of his wife's shooting death, Michael Warren was driving to a casino in Miami, the Palm Beach Post reported.
Officers arrested Warren 27 years later at her home in Abingdon, Va.
It was unknown if Sheila Keen Warren has an attorney.
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Aherns called 911 and also attempted to look for the white Chrysler convertible but in vain.
Marlene died of her injuries two days after the shooting.
The arrest brings only a sliver of closure for Warren's mother, Shirley Twing.
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. Inside the auto, they found orange fibers, possibly from the orange clown wig, and brown hair.
During the original investigation, detectives learned where Keen had bought the clown costume, balloons, and flowers.
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Michael Warren did serve several years in prison after he was convicted of grand theft, racketeering and odometer tampering, connected to the used vehicle business.