Former UVa student Andrew Alston, charged in the murder of Walter Sisk, of Free Union, is claiming in his defense that Sisk died because he stabbed himself, 18 times. John Correa, with whom Alston studied aikido in 2002, testified that each of the wounds on Sisk’s body are consistent with the use of standard aikido defense measures against an individual armed with a knife. The Nelson Muntz (“Why are you hitting yourself?”) Defense, if successful, could keep Alston from up to 40 years in prison. Liesel Nowak the story. in today’s Progress. 11/10 Update: The Cav. Daily reports that a jury found Alston guilty of voluntary manslaughter late last night.