What convicted father, daughter say happened to husband

Molly Corbett, 33, and her father, Thomas Martens, 67, both found guilty of murder, told ABC News in a pre-trial interview they were convinced Corbett's husband was trying to kill them.
4:35 | 08/11/17

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Transcript for What convicted father, daughter say happened to husband
Back now with that ABC news exclusive. The first interview with the former FBI agent, and his daughter convicted of murder who say they had no choice but to defend themselves from her husband. The two now facing up to 25 years behind bars and ABC's Linzie Janis is here with the story. Good morning, Linzie. Reporter: Good morning, Molly martens Corbett and her Irish husband Jason seemed to have it all. But she says it was all a facade. One that was totally shattered one weekend when her father visited the house and discovered her husband choking her. It was a shocking verdict. A former FBI agent and his daughter convicted of second degree murder for killing her husband, 39-year-old Jason Corbett. This morning, both facing 20 to 25 years in prison. My son-in-law got in a fight with my daughter. I may have killed him. Reporter: Before the trial I spoke exclusively with Molly martens Corbett and her father Tom about what they say happened in the early hours of August 2nd, 2015. Molly says it all began when Jason's 8-year-old daughter Sarah woke up allegedly sending him into a rage. I said she's just 8. She had a nightmare. I should be allowed to go upstairs and comfort our daughter and he forgot my parents were there. Reporter: Molly who met Jason when she became his au pair says knowing her parents in the house gave her more courage to stand up to him supply don't know what precisely woke me up. But what I heard were loud voices and I -- like thumping. Something bad was going on. So I grabbed that little league baseball bat and I ran upstairs. Were you yelling at him? Were you screaming -- No, I wasn't yelling. No, he wanted to shut me up so he covered my mouth and started choking me but at some point when he stopped I screamed and then he started again and the next thing, the next thing I remember is my dad standing in the doorway. What did you see? It's awful. He has his hands around her neck and I said let her go. And he said I'm going to kill her. And my thought was if he gets into the bathroom, if he gets that door between me and him she's dead and there's nothing I can do about it and so I reached around and I hit him in the back of the head with the baseball bat. Reporter: Tom says he hit him in the back of the head but it didn't stop Jason dragging Molly toward the bathroom. I'm in the bathroom with him and I hit him again, I mean I have room now and I hit him hard on the back of the head again. You hit him hard. Yeah, I did. He still got her by the throat but he changed his tactics and decides to come back at me. Jason just grabbed the bat away. It was like it was nothing. He could choke me with one hand and grab the bat with the other and he was just so much stronger and I was screaming don't hurt my dad. Don't hurt my dad and I thought he's going to hit my dad with the bat and that's it, he's going to kill my father. So I rush him and I grab the bat with two hands and I hang on with dear life and trying to hit him with the bat or my fist or anything else but I'll hang on to that bat. He went down. He went down. But prosecutors believe this bloody brick found in the bidroom tells a convincing story. The story of a wife in a murderous rage. In her police interview Molly admits she hit her husband with it. I hit him on the head. You hit him on the head with what. With a brick on economy nightstand. Reporter: In my interview she's more circumspect. Did you hit him with the paving tone. I'm not prepared to talk about that right now. In our interview she explains why that brick was in her bedroom and gives us more details about the alleged abuse she suffered. Abuse that the jury did not hear about at the trial. Prosecutors do not believe and Tom's version. They argue that they killed with malice and excessive force and clearly the jury agreed with them. We also spoke with some jurors who told us that they have a theory about what happened that night and it's one the prosecution didn't even suggest. Wow. And Molly didn't testify at the trial. Tom martens testified but mol Molly did not. You can see more on "20/20" at 10:00 P.M. Eastern on ABC. Thanks, again. Coming up, a terrifying

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

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