sheriff ron bruce, down from colorado, stood a few feet away. >> he looked at us almost in shock."i can't believe you people are taking this serious." >> how was that for you to finally make that arrest? >> it felt great. it felt great. and at that point, i said, "leslie, we're gonna make this right." >> reporter: alex was in school when he was suddenly pulled out of class. >> you know, there are some texas rangers here to talk to me. and, i kind of asked, you know, what's going on? why are you really here? "your father's been arrested." >> did you say anything back to them when they told you? >> i was just, like, "why?" and they said, "oh, well, we can't tell you that. we just have some great proof." and i said, "well, it took you four years. what exactly are you doing?" and they said, "well, we just can't tell you that." >> did you ever think for one second, "well, there must be something. he must have done something -- >> no. >> -- for him to be arrested, to be going through this?" >> no, never. >> we never doubted his story. we never doubted it. we never thought that he would'