In July 1957 two young police officers on a routine traffic stop in El Segundo, Calif., a Los Angeles suburb, were gunned down and murdered by a man who the police did not know had just committed robbery and rape at a nearby lover's lane. The gunman fled, triggering one of the largest manhunts in California's history. It would take detectives and modern science close to half a century to bring this case to a startling conclusion. Correspondent Bill Lagattuta reports