An Abingdon Virginia Woman Who Admitted To Killing Her Future Husband’s Wife While Dressed As A Clown Has Been Released From Prison. Sheila Keen-Warren Admitted To Second Degree Murder And Served Seven Years For The 1990 Florida Murder Of Marlene Warren. Prosecutors Say The Killer Shot Warren At Her Front Door After Delivering Balloons. Keen-Warren Later Married The Victim’s Husband And Moved To Abingdon Where They Ran The Purple Cow Restaurant In Kingsport For Several Years Before Selling It.