A Palm Beach County Sheriff's Office news release says 54-year-old Sheila Keen Warren was arrested Tuesday in Virginia. A Florida grand jury recently indicted her on a first-degree murder charge.
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Authorities say Marlene Warren was shot at her Wellington home in May 1990. Sheila Keen was considered a suspect but was not arrested.
Palm Beach County deputies reopened the case in 2014 and conducted a new DNA analysis. Detectives also learned that Sheila Keen married Marlene Warren's widower, Michael Warren, in 2002. The couple had been living in Tennessee.
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Detectives haven't said whether Michael Warren was involved in his former wife's death.
It wasn't known if Sheila Keen Warren has an attorney.