A 1964 kidnapping case has been reopened, after the man initially believed to be the kidnapping victim learned he is not.

According to CNN, Paul Joseph Fronczak was thought to be the victim of a 1964 kidnapping incident at a hospital when he was only a day old. The "audacious" kidnapping was carried out by a "woman dressing as a nurse who told the mother to hand over her infant because the doctor needed to examine him," he tells the news agency. He was then returned to his parents in Chicago at the age of two, several months after he was found in a stroller in New Jersey.

Now 49-years-old, Fronczak has found that he isn't the missing baby after all, a fact he discovered after taking a home DNA test.

"I was actually at work when I got the results, and the next hour, I was kind of sitting there just staring at my desk, you know," he told 8 News Now.

Reports say the FBI has reopened the case to solve the mystery of what are now two missing identities -- the victim of the 1964 kidnapping and Fronczak.

"I don't know how old I am, or who I am, or what nationality, all those things you just take for granted," Fronczak said, reports CNN. "The FBI decided that because my ears matched the Fronczak baby that I was probably the Fronczak baby."

Paul Joseph says that during the time of the incident the outpouring of affection and anger over the kidnapping case was "huge."

"My parents had letters from the pope, letters from people all over the country. It was a huge case," he told CNN.

However, amid the stunning news, he is determined to find not only his own identity, but that of his parents' missing child as well.

"My parents raised me and did a great job. I feel that if I don't do everything I can to help find their real child, then I'm not doing my job as a son. This is an incredible mystery," he told ABC News.

According to FBI special agent Joan Hyde, federal investigators will look into the case again. She hopes that today's technology will help them bring closure to the case.

"They conducted a thorough and complete investigation when it originally occurred, and we'll do that again," Hyde told CNN. "We now have technology and tests that we didn't have then, and we're hoping this time around we'll get that piece of information that will help us solve this case, either from evidence or witnesses."