John Allen Muhammad, the "D.C. Sniper," is scheduled to die by lethal injection tonight in Virginia. In October 2002, Muhammad and a then-teenaged accomplice terrorized the Washington D.C. area with a series of shootings. Cheryll Witz's father, Jerry Taylor, was killed by the snipers in March 2002. She will attend the execution tonight, and says a confession by one of the killers helped her get closure. We'll put the search for closure to Dr. Sindey Weissman, a psychiatrist and professor of psychology at Northwestern University.