Woman on Trial in Slaying of Boyfriend Claims Self-Defense

Tiniko Thompson has been charged with second degree murder of her boyfriend, Officer Carl Patrick, and lawyers now claiming he was physically abusive.
3:49 | 08/18/16

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Transcript for Woman on Trial in Slaying of Boyfriend Claims Self-Defense
We turn to a murder trial making headlines. A woman accused of killing her boyfriend, a Miami police officer, she's facing charges, her attorneys say it was self-defense but prosecutors say this is really a case of lies and deceit. ABC's Steve osunsami is live with us this morning. Steve? Reporter: Good morning to you, David. Tiniko Thompson has tried to claim self-defense to get this dismissed and it didn't work. After the shooting her boyfriend was still alive and she said she left him to die. In this courtroom lawyers fighting for her freedom say tiniko Thompson is a victim claiming that her police officer boyfriend was physically abusive showing what she says were injuries from the beatings and saying that she shot him accide accidentally as they struggled over his gun. Then the swabs come back positive for tiniko Thompson's dn. Up under his fingernails. Reporter: Even before being charged she told WTVY her boyfriend put a gun in her face the night he died in may of 2014. He scared me. I feared for my life and I held on. And we struggled because I wasn't going to let go. Reporter: The it's the same account she tearfully told investigators with cameras rolling. I didn't do -- I didn't kill Carl. I love Carl with all my heart. Reporter: But prosecutors say it's all a lie saying that for 13 months she pretended she was pregnant with his child even sending texts and photos to friends and the fight broke out, they say, when he learned the truth. The state says officer Patrick could have survived the gunshot wound but says Thompson never called for help and instead came and went from the home at least five times while his body was inside. At one point police say she is seen here on a security camera getting things from a storage space. The body was found in -- wrapped in a comforter between the walk and the vent. Reporter: She left a note saying it was an accident and could get life in prison if convicted. Prosecutors say she pretended she was pregnant so she could convince her boyfriend to live together. They also say that they had already named the baby, a girl, that was supposed to be named Victoria. David. All right, Steve osunsami with us this morning. Steve, thanks as always. Right to ABC news chief legal analyst Dan Abrams. We heard what Steve said, the evidence prosecutors will point to she never called for help, came and went five times. You were pointing out and also talk about where she targeted, where the gunshot was. Two key points here for prosecutors will be what did she do after the fact and the medical evidence. Prosecutors are going to say he was shot in the back and say if he's shot in the back how is that possibly self-defense? And also what she did after the fact. Meaning let's assume that this was self-defense. Let's assume she's trying to get away and shoots him. Then why wouldn't she try and get help for him afterwards? What her claim is going to be she wasn't thinking rationally. That she freaked out in essence and left, et cetera, so just what she did after the fact, I don't think is going to be enough for a conviction. They're going to need that medical evidence, I think, to be clear that he was shot in the back. If that's the case, this is going to be a stronger case for the prosecutors. You told us before when you talk about self-defense, that the prosecutors really have to make a case beyond reasonable doubt. It's still the prosecution's burden to prove the case beyond a reasonable doubt which means it's not self-defense and, look, she's got some real claims here about self-defense. She's going to argue there were injuries, they are going to say there weren't injuries. That's going to be one of the issues in the case and then prosecutors are going to effectively have to say that's not true. That can be very hard in certain self-defense case. You'll be here along the way. Dan, thanks so much. Right over to robin at the big

This transcript has been automatically generated and may not be 100% accurate.

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