New Details on the Philadelphia Abduction

New information shows how police pieced together the case and nabbed suspect.
4:14 | 11/07/14

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Transcript for New Details on the Philadelphia Abduction
But the dramatic rescue of the young woman snatched off the street in Philadelphia. We are learning about the kidnapper and how police found her. Mara schiavocampo has the story. Reporter: Gone in 30 seconds, found in 72 hours. Police say immediately after being snatched off this Philadelphia street and stuffed into this car, the fast-thinking 22-year-old nurse smashed out the back window with a hammer she found in the backseat. And even hit her alleged abductor, Delvin Barnes, in the head with it. Then, despite being subdued, police say she threw her cell phone out of the car so authorities would know her identity. While in captivity, she gave Barnes the atm card and pin number hoping it would lead police to her. And it did. Barnes was captured on surveillance video using the atm card at a bank. The car was fitted with a gps device like this one, that allows auto dealers to keep tabs on those with poor credit. Using it to find Barnes in this mall parking lot. Barnes climbed from the backseat to the front, trying to flee. That's when agents surrounded the car and moved in, rescuing carlesha. She was in a state of shock and hysteria. Reporter: When the surveillance images were released, police in Virginia recognized Barnes as their prime suspect in another kidnapping. Now the preacher's son seen here for the first time since his arrest is in Virginia, moved overnight to face charges in the other kidnapping. Including attempted capital murder in connection with a 16-year-old girl he allegedly kidnapped and tortured last month before she managed to escape. He has a 2005 conviction related to an attack on his estranged wife. . He's a vicious predator, off the streets, and hopefully in jail for the rest of his life. Reporter: Police say she has only minor physical injuries. She's home and resting and we want to move on. Reporter: For "Good morning America," Mara schiavocampo. ABC, Philadelphia. And bring in Dan Abrams. She did a lot to help herself, but terrific police work. Terrific policework, help from ordinary citizens. Linking up potato chips, receipts, surveillance video and finally ending up with a used car dealer who had put a gps on the car and could flip it on and find out exactly where he was. But let's keep in mind, the reason they were able to put those pieces together is because of really good police work and a lot of help from people calling in tips. On the other hand, there were some gaps here as well. Delvin Barnes are quite a record. And there are real questions about the Virginia case. On October 3rd, they take a DNA sample. Don't get the match until October 28th. Not a fault, but that's a problem with the system. We need a better system to take less than three weeks to get back that kind of result. It took that long to figure out this is the guy. We have him in our system. Number two, on October 28th, when they are able to identify him, why wasn't there an all-out bulletin put out? We need to find this guy. The authorities may say we didn't want to tip him off, we have answers to that. But those are two really important questions that need to be asked. And other people know that a used car dealer who sold a car could turn on the gps. It's amazing. But it sounds like the authorities knew that was a real possibility with people with bad credit. They often do it because they have payments to make over time. And they say, well, bad credit here, I'm worried we're going to need to repossess the car. The authorities knew about that, asked the specific question of the used car dealer so that they could then flip this on and find him within minutes. All came together. Amazing story the way they pieced it together. The team effort like you are talking about. Good old-fashioned police work, social media, and carlesha, here's my atm and pin, knowing they could track it. And answer to a lot of prayers. Absolutely. Thanks. Now to the terrifying

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

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