marshall put out a wanted poster for kaitlin armstrong. >> authorities believe that kaitlin armstrongody had mentioned something about a sister that lived in new york. >> eventually, members of the u.s. marshal service speak to kaitlin armstrong's sister who lives in upstate new york, but by then, kaitlin is no longer there. >> it's obvious that after a few days that she's made an attempt to disappear. >> someone else who desperately wants to find kaitlin, her father. >> and now we turn to the texas yoga instructor wanted for murder. her father is now speaking out. >> we love you, katie. we're going to figure this out. i know her. i know how she thinks and i know what she believes. and i know that she just would not do something like this. there are a lot of unanswered questions. >> but right now, the number one question everyone is asking, if you were kaitlin armstrong, where would you run? >> was that yoga mat caught on surveillance cameras at the airport a clue? >> she was into health, and fitness, and wellness, and yoga, and that eco lifestyle. so, in some ways, it was the perfect