Three decades after a woman in Florida was fatally shot by a person dressed as a clown, the longtime suspect – who went on to marry the victim’s widower – has pleaded guilty even as her lawyers maintain she is innocent. Sheila Keen-Warren, 59, withdrew her earlier plea of not guilty and entered a guilty plea on Tuesday as part of a plea deal with prosecutors just weeks before the case was set to go to trial. She pleaded guilty to second-degree murder in the May 1990 killing of Marlene Warren, who was shot and killed at her home near...