Mr. R.I.N.G. (aka Robomatic Internalized Nerve Ganglia). It was a top secret military robot on "Kolchak: The Night Stalker". This robot which was given "artificial intelligence" ends up killing someone in order to protect itself from being shut down. When will humans learn to either not give robots a survival instinct or not try to shut them down?
(Image courtesy of TV Tropes)