Nick Reiner faces charges of parricide — the killing of a parent by their child. It is one of the rarest crimes, and one of the most disturbing because it violates one of the most basic human bonds. Parents are supposed to protect their children. Children are not supposed to fear — or kill — their parents. This video examines the Nick Reiner murder trial, the meaning of parricide, and the warning signs and psychological factors experts say often precede these rare cases. | Dr. Phil