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Mistake or a killer trying to cover his tracks? that was the central question as the people versus lars itso began in december, 2016. the stakes were high. if lars was convicted of murder, he could face up to 99 years in prison. if he was convicted of manslaughter, as few as two. >> we never for a second believe he didn't know who that was standing in front of him. >> but the prosecutors knew proving intentional murder wouldn't be easy. >> especially in this case, though. where you have someone saying, i did it. i confess. but it was an accident. i love my wife. >> yeah, we were aware of that....

Now, back to "dateline." as 2015 gave way no 2016, investigators weren't so sure debbie kelly had been happy in her marriage to lars and they took a closer look at the circumstances of her death. they pulled all those recordings from the day of the shooting, examines lars' behavior, his terms of phrase. even things he didn't do starting with the 911 call. this is lars in the first moments of that call. >> i had a gunshot. i thought somebody was in the house. my wife. >> and you did shoot somebody? >> yes, ma'am. >> what is your name in. >> my name is lars itso. oh, man. >> what do you make o...