“Death Valley” is a serial documentary mini-series that explores the mental drift that led David Hotyat to murder Xavier Flactif, his wife Graziella Ortolano, and their three children in 2003. This series narrates the intertwined destinies of these two men. Xavier Flactif, a wealthy real estate developer, cunning and enjoying life. David Hotyat, a modest mechanic consumed by envy.