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Felt that he could also survey the area and see who else was around and what the chances were that this was a law enforcement operation. >> in fact, the long beach police have the park surrounded. we're there with our cameras. according to his chat, sierras is driving an suv. but suddenly, he drives up in a different vehicle and approaches the decoy. >> hey i look this way cause that's what i am so -- >> the conversation is hard to hear, but he's clearly suspicious. the decoy's hair looks different from the online photos sierras saw. >> i dyed my hair. since sthat picture. >> as i walk over to...

Then two years later, during "dateline's" investigation in petaluma, california, he began another sexually explicit chat with a decoy who told him she was 13. >> he wanted to come but he was afraid it was a setup. afterwards, he was remorseful that he didn't. >> fast forward to our current investigation. that same perverted justice decoy tells sierras, she is visiting a friend in long beach. they agree to a meeting in the park. now our decoy is waiting for sierras to arrive. >> are we copying this? everybody on this? >> we're about to find out that sierras has a violent past.

And brought to processing. we find out later that king runs this website called hot bare foot women. he later pleaded no contest to one count of an attempted lewd act upon a child and one count of attempting to send harmful matter. there is another potential predator who has a history with perverted justice. he doesn't want to come to our 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 with a decoy...

Set up in a nearby park, where a suspect may be thinking he can lure a young teen into his car. >> everybody on this? >> back at the house things will still get busy. >> hey, how are you doing? why don't you have a seat over there on that stool right there? are those your friends outside? >> with some trying to make a getaway. >> take him. take him. he's running. >> but the police will have other plans. >> get on your knees now! >> you'll find some guidelines on how to protect your kids against online predators on our website. the address is dateline.msnbc.com. >> that's all for now. i'm ann c...

To tell me, michael? >> i know i did wrong. >> you did wrong. >> can i go? >> michael, you can go, but i'm going to remind you that i'm chris hansen with "dateline nbc" and we're doing another story on adults who try to meet kids on the internet for sex. >> i know i did wrong. >> you can go. you can go right now and walk right out that door. >> any cops out there? >> that's not up to me, michael. >> yeah, it is. >> i'm not the police. so why don't you go ahead, michael? it's time to go. >> seibert clearly doesn't want to leave. having been through this before, he knows the police are waiting o...