Robert Stack, whose granite-eyed stare and menacing baritone spelled trouble for fictional criminals in TV's The Untouchables and real ones in Unsolved Mysteries, has died at his home. He was 84.

Robert Stack, the tough-guy hero of TV's "Untouchables," was remembered Thursday as a real-life softie. Stack, 84, was found dead of a heart attack Wednesday evening at his home by his wife, Rosemarie ...