Dan Markel was a prominent Florida State University lawprofessor. But in 2014, he was found gunned down in hisTallahassee home. As authorities begin investigating hismurder, they identify someone close to home as the possiblemastermind behind the killing: Donna Adelson, Dan's formermother-in-law. Dan was embroiled in a bitter divorce andcustody battle with Donna's daughter, Wendi, and prosecutorssay this 75-year-old grandmother orchestrated an elaboratemurder scheme. "20/20" has followed this case for more than adecade. Correspondent Ryan Smith brings viewers inside thetwists and turns of this case, including the latest on thetrial, verdict and murder that shattered a family and shockedthe nation.
