Searching for Answers in the 1964 Fronczak Chicago Infant Kidnapping

Paul Fronzczak discovered he wasn?t the biological son kidnapped from Reese Hospital 50 years ago.
2:29 | 11/01/13

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Transcript for Searching for Answers in the 1964 Fronczak Chicago Infant Kidnapping
a 20/20 investigation, the extraordinary mystery decades in the making, the case of the baby the nation followed and the man who for years thought that baby was him. Tonight now in search of his new and real identity. Abc's barbara walters investigates. Paul fronczak does not know his birthplace, his age even his real name. It's a nearly 50-year-old case now reopened by the fbi. We'll do everything that we can to follow up to see if that baby is out there. This is the first time these dusty case files have seen the light of day in decades. The mystery began in 1964, when baby paul fronczak was kidnapped just hours after being born in a chicago hospital. Must have been desperate for a baby that she would come and take somebody else's baby away from them. Over a year later, a child was found abandoned in newark, new jersey. Somebody wheels a stroller, puts you here. Walks away. And never looks back. The fronczaks claimed the little boy was their own and took him home to chicago. A year ago a dna test showed he is not the fronczak's biological child after all. I feel kind of like an impostor I'm using his birth certificate and I want to give it to him and find mine. The national center for missing and exploited children created this age progression image. The photographs have resulted in the first solid leads in 50 years, several men have come forward believing they may be the real stolen baby. I do believe that there is a chance of me being paul fronczak. Who is paul fronczak? That's what I hope we can find. This is really something. Barbara is with us now. You can see it in your interviews with them. What has this done to his life? Well, he's obsessed by finding out who he is. It's made a strain with his family. Leave sleeping dogs lie the say. His wife says he's too emotional about it. It's changed every aspect of his life. When see his story, you'll know why. Barbara, your investigation uncovers just how many other men are asking the same thing. Yeah. They say, I'm paul fronczak. No, I'm paul fronczak. This is what we're trying to answer, what he's trying to answer. Who is paul fronczak? Barbara, thank you. That's the question for everyone at home watching tonight. You've got to see barbara walters' 20/20 investigation stolen at birth tonight at 10:00 eastern right here on abc.

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

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