>> welcome back to dateline, i'm natalie morales. in 1983, a young mother of two was brutally killed, in her southern california home. the investigation went cold, until more than two decades later, a curious detective hoped new technology could help crack the case. would there be another of evidence to finally saw the missy? here again is keith morrison, with haunting images. >> gregory moore dick wanted to first start. he was not the single father of two small daughters. bringing them up, amongst suspicion laws, where the mother was murder, was increasingly unappealing. so, gregory set up house in eastern washington. in the middle class home unspoken. he went about organizing a normal life. he was, generally, agreed an excellent father to see little girls. >> they had security, they had