i did not do this! reporter: she was upset. she felt like history was repeating itself. he wanted to have women and his wife was getting in the way. were police just plain wrong? it s like this twilight zone where lies become truth and the truth becomes lies. reporter: maybe the real killer was still out there. you have lied to the police about this case. yes, sir. so devastating. we knew that that was probably the key to solving this. thirteen years. thirteen years of hell! reporter: hello and welcome to dateline extra. i am craig melvin. what happened in the family garage was both a tragedy and a mystery. at the crime scene police uncovered clues that would lead them on a long road to justice, and there were two potential killers but only one truth. here s dennis murphy. reporter: such an awful crime. the wife. the little boy and girl. my kids are dead. reporter: shot at point blank range. i was just dumbfounded. i was shocked, what i saw. re
reporter: she was upset. she felt like history was repeating itself. he wanted to have women and his wife was getting in the way. were police just plain wrong? it s like this twilight zone where lies become truth and the truth becomes lies. reporter: maybe the real killer was still out there. you have lied to the police about this case. yes, sir. so devastating. we knew that that was probably the key to solving this. thirteen years. thirteen years of hell! reporter: such an awful crime. the wife. the little boy and girl. my kids are dead. reporter: shot at point blank range. i was just dumbfounded. i was shocked, what i saw. reporter: how to comprehend it? i said, what? what are you, what are you talking about? what are you saying? reporter: the husband had an alibi. could he have slipped away for, say, ten minutes? he could ve done anything. but he didn t. reporter: 13 years. three trials, appeals, reversals. and changing stories.
reporter: his fellow cops suspected him! i did not do this. i did not do this! reporter: she was upset. she felt like history was repeating itself. he wanted to have women and his wife was getting in the way. were police just plain wrong? it s like this twilight zone where lies become truth and the truth becomes lies. reporter: maybe the real killer was still out there. you have lied to the police about this case. yes, sir. so devastating. we knew that that was probably the key to solving this. thirteen years. thirteen years of hell! mystery on lockhart road. hello and welcome to dateline extra. i m craig melvin. david came home one evening to find his entire world turned upside down. what happened in the family garage was both a tragedy and a mystery. at the crime scene, police uncovered clues that would lead them on a long road to justice. there were two potential killers. but only one truth. here is dennis murphy. reporter: such an awful crime. th
i did not do this. she was upset. she felt history was repeating itself. he wanted to have the woman, his wife was in the way. were police playing wrong? it is like a spotlight zone. lies become the truth and truth becomes the lies. maybe the real killer is still out there. you have lied to the police about this case? yes, sir. devastating. we knew that was from and keep solving this. 13 years. such an awful crime. the wife. the little boy and girl shot at point-blank range. i was dumbfounded and shocked of what i saw. how to comprehend it? i said what, what are you talking about? what are you saying? the husband had an alibi. he could not haves done anything. 13 years, three trials, appeals and reversals and changing story. a big picture here, a lot of people are sentenced to the crime. it does not pass the sniff test. it has been a long pursuit of justice. it gets more and more wrong. i kind of adopted this saying that when you enter into
(second woman) we also keep them ready for the next big opportunity. like 5g. almost all of the fortune 500 partner with us. (woman) when it comes to digital transformation. verizon keeps business ready. male anchor: .an update on the cat who captured our hearts. female anchor: how often should you clean your fridge? stay tuned to find out. male anchor: beats the odds at the box office to become a rare non-franchise hit. you can give help and hope to those in need. 1 in 5 people you meet wear yeah. that many! but right now, is not the time to talk about it. so when you re ready, search my denture care . poligrip and polident. fixed. fresh. and just between us. welcome back to dateline extra. i m craig melvin. while david camm was serving his 195-year prison sentence, his new attorneys were hard at work trying to get him out. they believed he was innocent and the key to cracking the mystery had to be hidden somewhere in that sweatshirt found at the crime scene. but first, t