Gregory Peck, who led the ensemble as Captain Keith Mallory, succumbed on June 12, 2003. Despite his illustrious career and Oscar-winning role in “To Kill a Mockingbird,” Peck faced unimaginable personal heartbreak, including the suicide of his son. David Niven, the witty Corporal John Miller, was silenced by ALS, passing on July 29, 1983, after a life marked by tragedy and professional triumphs.