Investigation Discovery's series follows lovers as they embark on doomed romances that end in unexpectedly tragic ways. Each hour-long episode tells a tale of a love affair that turned lethal, from a husband who poisons his wife's Kool-Aid to a pet parrot repeating its owner's last words. Illustrated through split-screen archives and new materials, "`Til Death Do Us Part" includes interviews with family, friends and law enforcement personnel who paint a picture of love stories twisted by rage, curdled by obsession and crippled by paranoia.