Relatives told The Palm Beach Post in 2000 that Marlene Warren, who was 40 when she died, suspected her husband was having an affair and wanted to leave him.
"It was rumored Sheila Keen and Michael Warren were having an affair", McCann said.
Warren's husband owned a auto dealership; she managed the couple's rental properties.
The shared last name is no coincidence; Sheila Keen-Warren married Marlene Warren's husband in 2002.
On May 26, 1990, a Florida woman was fatally shot in what was reported as the "crime of the year".
Employees of a local costume shop called detectives on the night of the murder and said a woman had bought a clown costume and makeup two days prior.
Detectives learned that the balloons and floral arrangement had been purchased at a Publix near the suspect's apartment that same day.
Witnesses said they heard a gunshot before Warren fell to the ground.
And Keen's neighbors said Warren visited Keen often. They were also booked for previous charges, per Fox 13, though the nature of those priors is not clear.
"Taking another person's life is a horrific incident", said Palm Beach County sheriff's Sgt. Richard McAfee in a news conference while speaking of the decision to wear a clown costume. In 2002, he resurfaced, marrying Sheila Keen.
Five minutes from their house in Abingdon, Va., in the Blue Ridge Mountains near the Tennessee state line, their Cadillac SUV was stopped by deputies. "As a result of the investigation, probable cause was established linking Sheila Keen Warren to the murder of Marlene Warren". The couple had moved to Tennessee, where they operated a restaurant together.
She was jailed without bail to await extradition to Florida on first-degree murder charges.
In the wake of the killing, police discovered several connections between Michael and Keen Warren.
Shirley Twing, also speaking to the Post at the time, recalled Marlene once telling her: "If anything happens to me, Mike done it". She declined to provide additional information about the evidence, but said the technology was not available in 1990.
Authorities have not yet disclosed the new evidence that finally led to Shelia's arrest. "They could have rolled the dice and lost, and you could have never charged her again".
Palm Beach County Sheriff Ric Bradshaw said that without the advances, detectives would not have been able to conclusively tie 54-year-old Sheila Keen Warren to the slaying of Marlene Warren.
Despite the efforts of detectives, there wasn't enough DNA evidence at the time to convict either of them.