An Abingdon Virginia Woman Accused Of Dressing As A Clown And Killing Another Woman Outside Her South Florida Home In 1990 Has Plead Guilty. Sheila Keen-Warren Pleaded Guilty To One Count Of Second Degree Murder In The Death Of Marlene Warren, Who At The Time Was Married To Her Current Husband. Keen-Warren Was Ordered To Spend 12 Years In Prison. Shehad Once Owned The Purple Cow Restaurant In Kingsport.