Heartbroken family of missing boy: 'This child is not our beloved Timmothy'

Authorities said they want to know why Brian Michael Rini, 23, of Ohio, claimed to be a young boy who vanished in 2011 after last being seen on video with his mother.
3:26 | 04/04/19

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Transcript for Heartbroken family of missing boy: 'This child is not our beloved Timmothy'
And we begin tonight with that heartbreaking news turn late today in the case of that missing 6-year-old boy that riveted much of the nation. Timmothy Pitzen is the Illinois boy who was last seen when he was just 6. This surveillance of him with his mother among the last images of him. Overnight, we reported a young man coming forward, telling police he had just escaped, he ran across state lines, he said. The family of the boy suddenly filled with new hope after waiting for so many years. And then, just a short time ago, the FBI revealing it is not the boy. Heartbreak again. And what would lead someone to do this? ABC's whit Johnson leading us off from Cincinnati. Reporter: Tonight, heartbreak for the family of missing timmothy Pitzen, after the FBI announced a DNA test confirms the mysterious young man who showed up in Kentucky is not who he claimed to be. It's devastating. Yeah. It's like reliving that day all over again. And timmothy's father is devastated once again. Reporter: Instead, authorities say this is not a boy at all, but a 23-year-old man from Ohio, Brian Michael Rini. Prison records there show a man there with the same name served time. And tonight, they want to know why they told this elaborate tale, giving a family false hope. Oh, it's kind of back to ground zero for us. Kind of reliving everything that did happen and renewing the loss one more time. Reporter: Since 2011, Pitzen's family has served for the little boy who vanished with his mother when he was just 6 years old. It's just more devastated than anything else. Where's Tim at? If I knew where he was, I'd go get him. I'd do just about anything to get him back. Reporter: His mother seen on surveillance taking him out of school and on trip to a zoo and water parks. Days later, committing suicide, leaving a chilling note saying timmothy was safe but would never be found. He's with a 14-year-old juvenile, male, white, says he was kidnapped from somewhere. Reporter: Eight years later, this man in a hoodie showing up a northern Kentucky Sharon hall snapping this picture. I could see the side of his face was scarred up, almost like he had been on concrete or something, like scars. Reporter: Like he had injuries or something? Yeah, and his face was real he was just frantic. Reporter: He told a harrowing story about he has just escaped his kidnappers. He walked up to my car. And he went, "Can you help me, I just want to get home." And he told me he's been kidnapped and he's been traded through all these people. Reporter: But that lie is not discouraging timmothy Pitzen's family. We know you are out there somewhere, Tim. And we will never stop looking for you. Praying for you and loving you. And whit Johnson joins us live tonight from outside the FBI in Cincinnati. Whit, we can't imagine what this family is going through, this roller coaster of a 24 hours. They had new hope for some time, and where does this case go from here? Reporter: Well, David, a spokesperson with the Aurora, Illinois, police department, when asked if anything good can come from this case, he said it did create a renewed awareness in the disappearance, but tonight, it is still unclear what charges could be in store for the man who made this whole thing up. David? Whit Johnson tonight, thank you. We are also following a

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

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