>> reporter: to what extent were you thinking? >> i didn't know. if he'd hired somebody to do somethin', who knows what they're gonna do? >> reporter: turns out, the bail bondsman also happened to be a city councilman and a friend of the houston police chief. so, he gave the chief a call and said they should take a closer look at leon and the mysterious zack. coming up -- an undercover mission to learn what leon's really up to. >> he's giving you a way to kill someone. >> very detailed, precise instruction. >> and the real jaw-dropper? meghan wasn't the only target. >> we're taking care of both problems? >> what both problems? >> both of the individuals we're talking about. >> when "dateline" continues. atf fitness. it's every class you can imagine. live... welcome back to the mirror. you've got this, john. ... and on demand. it's boxing, cardio, yoga, and