Lyle Menendez Speaks Out About His Father

Lyle Menendez describes his father, Jose Menendez, was "like a force of nature" decades after he and his brother were convicted of killing their dad and mom Kitty Menendez.
5:19 | 01/05/17

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Transcript for Lyle Menendez Speaks Out About His Father
We begin with that ABC news exclusive hour, inside the Beverly hills murders that shook the nation 30 years ago. This morning, a look at never before seen home movies and why the brothers say they did it. Terry Moran is back with us this morning. This story has just continued to fascinate people. The response we have been getting online and on social media to tonight's documentary on ABC has been remarkle. Because it's a family story. Families, the crucible of our emotions. Where are most important connections are forged. The Menendez trial was the sensation. At the time some calling it the crime of the century. Outside the courtroom it was pure pandemonium. It was the case of two young and rich men, Erik and Lyle Menendez accused of the shotgun murders of their parents. I first saw him walk in the courtroom my blood went cold. Reporter: But the real scene was inside the courtroom with prosecutors -- It will became apparent that this murder was unjustify. Reporter: And defense attorneys hurling dueling claims. The origin of this killing was a lifetime of abuse at the hands of those same parents. Reporter: Prosecutors had strong evidence, graphic evidence of the crime scene. This is her before and this is her after. Reporter: Experts -- and even a confession by the brothers to their therapist. Did you ask them why they killed their mother? They felt they were putting their mother out of the misery. Reporter: The ultimate question was, why they killed their parents. He killed the parents because he no longer endure the abuse. Reporter: Both brothers took the stand and told about the abuse. Telling Lyle what. My dad had been molesting me. You could hear a pin drop in the courtroom and that's when I thought, oh, darn, I'm in trouble. Reporter: Two family members stayed both Lyle and Erik had told them of the abuse years before. By the time of the killings, Jose Menendez had gone disgusted with his sons. Another Menendez when I was doing a photo shoot in Beverly hills. He was natural in front of the camera, he was very comfortable. I don't think Erik had the physical attributes to be a working model but he was photogenic. I think Erik was struggling to find his way and I don't know the insides of what went on in their house because he didn't talk about it. Describe your relationship with your father if. Brutal. Painful. Torturo torturous. But yet I admired him because he was so strong and he was -- he was everything that success was that I was taught that success was. And I thought that he was the most powerful and brilliant person I had ever meant. Reporter: Though the first trial ended in a hungry jury they were convicted of first-degree murder. Sentenced to life in prison and no chance at parole. #. It's shocking to think about that that happened. It's still jarring ly. Reporter: Speaking to ABC news from prison all these years later, Lyle Menendez still speaks of passion about the man he loved and feared. My father was like a force of nature and you look up to that. You were expected to which be competitive to a fault. He began to sort of try to groom me to be hypercompetitive and succeed. Lyle and Erik are serving out their separate life sentences in separate prisons. They're still in touch. They play chess, one move at a time by snail mail. All their appeals have been exhausted. They are in prison for the rest of their lives. It was captivating then and is now it airs tonight at 9:00 P.M. Eastern right here on ABC.

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

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