The Case Against Nicole Addimando - Encore

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(upbeat music) - She was afraid for her life. I mean, I was constantly afraid for her life. I messaged her every morning to see if she was still alive. (dramatic music) On the night of the shooting, my phone rang. And it was little after two in the morning. (dramatic music) - Thank you, Max. - And it's Nikki. She sounded so scared. (dramatic music) - Nikki Adamanda, better than anybody else in this world, knew how dangerous he was at that moment. (dramatic music) - She had been asking him throughout the night, you know, just let us leave, just let me leave with the kids. (dramatic music) - He pulled a gun out of the couch and said he would kill her. And when she did that, the gun fell to the floor. - I picked it up and he said, "Wouldn't do it." (dramatic music) (dramatic music) - I picked it up and he said, "Wouldn't do it." (dramatic music) - Nikki didn't attempt to evade the police and didn't hide the fact that she shot him. - He's lying on the couch. (dramatic music) (dramatic music) - Nikki is the most gentle, loving friend we've ever had. - Everything she does is for her kids. - In hindsight, it's so easy to connect the dots. - There were so many instances where I would notice a bruise. She attributed it to playing with the kids and some kind of accident. - We had medical documents demonstrating physical injuries. - There were many things that were going on. - Physical injuries. - There were many people who saw her with black eyes, with bruises, injuries. - On her face, sir, on her neck. - We had bite marks on her back. - Burn marks. - Well, if that's true, as a prosecutor, it's my obligation to investigate it. - Anyone who knew Chris was there to support him. - He was my gymnastics coach. He always made us feel safe.
Transcription truncated.
A young mother shoots her partner claiming self-defense and abuse. The killing of the popular gymnastics coach divides a town. CBS News correspondent Jericka Duncan reports for "48 Hours."