Jodi Arias speaks out in never-before-seen footage

Arias describes being baptized into the Mormon church by her then-boyfriend Travis Alexander, whom she was later convicted of killing.
4:10 | 02/14/20

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Transcript for Jodi Arias speaks out in never-before-seen footage
Back now with an inside look at the notorious murder case that gripped the country. Jodi Arias convicted of killing her former boyfriend, Travis Alexander. This this morning we're seeing never before seen footage of an interview with Arias. Deborah Roberts is here with that. Good morning. This was the x-rated murder trial that left hardened lawyers and reporters blushing during explicit testimony and sexually revealing evidence. Arias testifying an unbelievable 1 days and jurors had to decide whether the 32-year-old was a villain or a victim. It was the trial that captivated the nation. Did you kill Travis Alexander on June 4th, 2008? Yes, I did. Reporter: Jodi Arias convicted in 2013 of brutally stabbing and shooting her ex-lover, Travis Alexander. Prosecutors say in a fit of rage. I said, Travis, I'm afraid we're going to find you chopped up in her freezer. Reporter: They met in 2006. There was an instant connection. Their relationship was white hot sex. The biggest problem, however, when it came to any kind of romantic relationship was one of religion. Travis Alexander was Mormon and Jodi Arias was not. Reporter: She joined the church, one she discussed in this. Travis baptized Jodi himself and there is a picture of the two of them before the ceremony. He baptized me and it was emotional, it was spiritual. It was powerful. It's a feeling that like everything just comes right into alignment and nothing can go wrong. Reporter: Friends noticed it took a dark turn. Travis had begun to see things in Jodi he wasn't happy W the obsession and everything he told her, you know, I don't want to be together with you anymore. This isn't going anywhere. Within weeks of them breaking up, Jodi does the unthinkable to any guy who is trying to break up with a woman. She packs up her staff and moves to Mesa, Arizona, to be closer to him. Reporter: Less than a year later though she moves back to California. It just became obvious at the time we needed to grow apart. Reporter: On June 9th, his roommate fines the key to his bedroom where he makes a grisly discovery. He had been murdered at least three times over. Reporter: At the crime scene police find a camera in the washing machine revealed to have photos from the day of the murder. Just over a month later, Arias is interrogated then arrested by police. They say she exhibited bizarre behavior and had a story that didn't add up. Could show you proof you were there? Would that change your mind? I wasn't there. You guys had a sexual encounter, which there's pictures. Now I know you know there's pictures because I have them. Are you sure it's me? I mean, 'cause I was not there. Jodi, it's you. Reporter: Four years later at trial Jodi Arias claims self-defense telling the jury that Alexander erupted after she dropped that very camera. We were trying out different poses and as I moved the camera it slipped out of my hand. Travis slipped out and stepped out of the shower. Reporter: She testified she ran from Alexander and grabbed a gun. Like a linebacker he got kind of low and grabbed my waist. Before he did that as he was lunging at me the gun went off. Reporter: But the jury didn't buy it. We the jury duly empaneled and sworn do find the defendant as to count one first degree murder guilty. Reporter: Jodi Arias is now serving a life sentence but she may have a shot at freedom. Her attorneys have filed an appeal and they are now awaiting and they could get word on that appeal any day now so we'll see what happens. Wow. More details tonight that you have not heard on our "20/20" report. This case is still gripping. Yeah, totally. Thank you, Debrah. See the two-hour forecast "20/20" special tonight at 9:00 eastern right here on ABC.

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

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