A man casually details to police how he killed his wife and later drops a bombshell about a 1988 cold case murder; a Michigan woman's bludgeoning death leads police to her fiancé, a career criminal who served time for a suspected 1,200 crimes.

An Iowa man describes in bone-chilling detail the horrors he inflicted on his doting parents; a mother reports her violent son, Chris, to police just days before they find her dead.