The Killing of Officer Green

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(upbeat music) Erica Sandoval is the person that you could meet on the street and say, wow, she seems like a really nice person. She had the type of upbringing that millions of people have had before. She dated, she fell in love. (upbeat music) She was so into Daniel. The first time she spoke about him, she was just like, hold color of his eyes and that he was so nice to her. She was just in heaven. All Daniel truly wanted was a family. That's all he ever wanted. And that's what he was trying to achieve with Erica. My name is Misty Gray and I am Daniel's little sister. My name is Matthew Green and I am Daniel's identical twin brother, four minutes, give or take, you know. Erica always wanted to just have a stable relationship, have children. They went together very long before they got married. When everything was going the way they should be in her eyes, she was pleasant to be around. It's only when things didn't go her way that she became nasty and things got ugly between the two of them. And from what I saw, the bad was really bad. She had cut up the couch and she had cut up the bed springs and stabbed holes in the wall and, you know, taking a bottle of, like, pancake syrup and just spread it all over the carpet. Just a ridiculous amount of vandalism. It was a very toxic relationship. People should absolutely know and understand that it doesn't matter if you're a man or a woman, you're five foot or six foot, you can be a victim of domestic violence. - Matt, did you ever tell Daniel to leave? - Of course, a lot. - A lot, yeah. - She knew it was bad. People don't change, she's not gonna change. That's not what happens. - Daniel loved being a cop. We love getting out into the community and making a difference. So on the day of the incident, Daniel was supposed to come into work right before me. When I got to the police station,
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A California police officer shot dead in his home -- his ex-wife admits she pulled the trigger. Did a photo posted on social media lead to the officer’s death? "48 Hours" correspondent Erin Moriarty reports.