Video: 'Valerie Percy Slaying Mystery 50 Years Later'

(Sunday, September 18, 1966, a few minutes after 5:05 a.m. CDT) — Valerie Jeanne Percy, the 21-year-old twin daughter of Republican Senate candidate Charles H. Percy, was beaten and stabbed to death by an intruder early this morning in her second-floor bedroom at the family’s palatial home on Lake Michigan in Kenilworth, Illinois.

Although her stepmother had a brief glimpse of the killer and considerable resources were devoted to solving the crime, the identity of the murderer remains unknown.