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House either so our decoy is now waiting for him in the park. so are "dateline's" cameras. he is 48-year-old frank sierras. back in 2004, before "dateline" was working with perverted justice, sierras using the name pitbulldavid2001 chatted online a decoy who said she was 13. he sent pictures of his penis and told her, i want to make love to you. i know i will say i love you when i am making love to you. >> back then, perverted justice put its chat on the website but he was never charged with any crime. then two years later, during "dateline's" investigation in petaluma, california, he began an...

Can't -- >> i'm more than happy to tell you who i am. i'm chris hansen with "dateline nbc" and we're doing an investigation on computer predators. >> oh, now. come on. >> you don't want to touch anybody. you don't want to -- >> it was really only one of the times -- the only time, really, when someone physically lunged at me. looking back, i don't think i was in much danger. but you can see how the security system works. our guy stepped in. took care of it. and diffused the situation. >> you got to stop this. >> sit down. sit down. >> you're free to leave any time. >> we got phone calls from h...

>> 20s? >> uh-huh. who are you? >> what age did brandon tell you he was? >> 23, i believe. >> want to try again? >> no, he said he was 23. what's the problem? >> i have the transcript, that's what the problem is. brandon said he was 13. >> 13? >> 13. >> no, no, he didn't. >> you are crazy for the nats? >> yeah. >> meaning the baseball team? >> uh-huh. >> if you don't see how graphic some of these chats are then there's a tendency to maybe give these guys the benefit of the doubt. maybe it was his first time. maybe he was just curious. but when you read the transcripts top to bottom, you know w...

>> this was only our second investigation so when he says, i like what you guys are doing, i believe in it, i want to help, i'm thinking he believes we're the police. so my impression was that he was offering to cooperate in another police investigation. he would help us in any way he could to catch other predators if we'd cut him some slack or perhaps even let him off the hook. >> i was wrong for what i did. i know that. i will do anything to help you guys out. >> what should happen to you? >> counseling. obviously, i would like to be able to be given the chance to help you guys out any way i...

>> can you tell me who you are? >> i'm chris hansen with "dateline nbc" and we're doing a story on computer predators. and if there's anything else you would like to say, we'd like to hear it. >> you never get used to seeing a teacher surface in one of these investigations, but the very first time, i was just shaking my head. it's like, how could somebody involved in educating kids, in this was special education, even a screenname, crazy for the nats, the nationals, the baseball team, would indicate that he's just a regular guy. teacher taking the summer off, 50-something years old, going to b...