How John Giuca's mother fought to try to prove his innocence

ABC News' Juju Chang gave "GMA" a first look at a new "20/20" special about one mother's fight to try to prove her son's innocence.
3:05 | 05/17/19

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Transcript for How John Giuca's mother fought to try to prove his innocence
We have the story now of a mom who did everything she could to get her son out of prison. He was convicted of felony murder. In twobts's "20/20" documentary we see how his mother went undercover to get his freedom. Can you imagine if your child was accused of murder, right? No. We've all heard moms say I'd do anything for my child. Well, Doreen Quinn Juliano put that into overdrive and took on jaw-dropping disguises and turned her life upside down to fight for her son's wrongful conviction. It earned her the nickname mother justice. Outraged by her son's guilty verdict for the murder of 19-year-old Marc fisher, Doreen Quinn Juliano became her own private investigator focusing on the jurors who convicted her son after deliberating less than two hours. I'm devastated. But that doesn't mean I'm going to give up. I'm never going to give up. John is innocent. Reporter: It's fair to say that what she did few mothers would ever consider. What made you decide to go undercover. I knew they had the wrong verdict. So I had to take a closer look at them. Reporter: After weeks of scouring jury questionnaires, Doreen finally had a lead. Juror number 8, Jason Alo may have known some of her friend's sons and if true she believes it should have disqualified him as a juror. She figured that the best approach would be to create this honey trap situation where she would get the juror to find her attractive. Reporter: These pictures of her radical transformation were taken for a "Vanity fair" magazine shoot. You were going to woo him. Yeah, I knew I needed to use whatever I could, you know, low cut blouse, push-up bra. You would have done whatever it took. Yes. Even it meant taking him to bed. Of course, of course. But it didn't come to that. No. No. Reporter: They drank wine at the bachelorette pad she rented. Ate take-out. Listening to the rolling stones but turns out all the while in addition to her push-up bra and Daisy dukes Doreen was wearing something else, a wire. And you kept it where? Between my boobs. Reporter: She spent months building his trust. Eventually turning their conversations towards her son John's murder trial. The undercover mother finally getting what she thinks she needs to go to court and get her son's conviction overturned. Technically by law if I knew that I shouldn't have even been in that jury. Say that again. I shouldn't have even been in that jury. Alo was cleared of any wrongdoing but Doreen and her defense team did manage to get her son's conviction overturned based not on that undercover operation but because the prosecutors withheld key information from the defense. But John her son is still behind bars perhaps awaiting another in fact, I went to rikers island just a few days ago and he told me all of why he thinks the prosecutors got it all wrong. We'll hear all that tonight. Absolutely. Juju, thank you. Happy Friday.

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

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