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They're just all over each other. >> and you're like, "ew." [ laughter ] >> reporter: these are the muellers' three children -- amanda, the eldest, then ariel, and alex, the youngest and only boy. they were brought up in texas, near the town of san angelo, but for fun the family headed out to their second home in lake city, colorado. those photos of their parents were taken nearby. >> they both loved the cabin, and going up to colorado. >> it was so pretty. it was in a valley, and there were just --n and it would look like a postcard, the mountains. >> there was a river running right near ther...

Investigation was able to develop. >> at what point did you finally, all of you, say we've got enough, let's go get him? >> i think it's when we felt like we had tested the thing to death. we had absolutely everything we could put together to take to the jury. >> february 6, 2012, just over 3 1/2 years since leslie mueller died. on monday fred was at his office when a texas ranger showed up with an arrest warrant in hand. >> he looked at us almost in shock and he said i can't believe you people are taking this serious. >> how was that for you to finally make that arrest? >> it felt great. it f...

At the start of the trail. among them was hinsdale county sheriff's deputy justin casey. >> we had other officers responding, that we also had the e.m.s. personnel coming in ambulances, and we had fire personnel coming with the fire trucks. >> reporter: dispatch put a call in to the local sheriff, ron bruce. >> we had gotten a report of a drowning up on cottonwood creek. and they said they'd keep me advised. >> reporter: by then, a group of medical responders made their way up to the creek to help. but still, no heartbeat, not a breath from leslie. and it was clear, she was gone. >> we were no...

The defense argued for his release on bond and the judge granted it. >> i just -- i can't wait to be able to give him a hug and just talk to him whenever i want. >> reporter: now, one full year after losing his freedom, fred was going to get out of jail. his daughters and new wife wendee gathered to embrace him. son alex, who was traveling, called in for an update. >> we're all at the jail right now just waiting for your dad. it's alex. >> we hadn't given him a hug in a year. we haven't been able to see him in person in a year. >> i love you guys. >> it was so wonderful to get the hug that we ...

Your father's been arrested. >> did you say anything back to them when they told you? >> i was like why, and they said we can't tell you that, we just have some great proof. and i said it took you 4 years, what exactly are you doing? and they said we just can't tell you that. >> did you ever think for one second, well, there must be something, he must have done something for him to be arrested to go through this? >> no, we never doubted his story. we never thought he would have done anything wrong or anything to hurt mom ever. that's something that i can't even fathom because he would have nev...