When a 79-year-old woman is found shot to death in her own home, investigators initially suspect her long-time husband and a violent neighbor with a penchant for threats. But shell casings recovered at the scene and a high-tech database reveal the killer to be the last person anyone suspected.To learn more about how HLN protects listener privacy, visit cnn.com/privacyLearn more about your ad choices. Visit podcastchoices.com/adchoices