>> reporter: leon clearly hated the guy. so who was he? >> i've never met a human being like her ex-husband, and i've met some pretty bad people. >> reporter: her ex-husband. he meant valerie's ex-husband mack. that's right, this murder-for-hire was a double plot, a two-fer. it seemed leon and valerie both wanted their exes dead. leon and taz left the table for a smoke and valerie talked specifics with adam about how he could bump off her ex-husband. >> he could have a boating accident. harder? >> reporter: the undercover officer suggested some simpler execution options. >> take his car, leave him on the street. make sure he's dead. maybe put another bullet in his head. we call that a "double tap." they'll think it was a robbery. >> reporter: but first, adam wanted to know, was she sure? >> you need to give me the go-ahead. there's no going back on this, okay. >> what option do i have? he's gonna take my daughter. >> reporter: of course, explained adam, a second target would cost extra money. leon returned to the table to negotiate a payment plan. >> $5,000. >> after everything is done -- >> we'll take care of it. >> reporter: listening in from a nearby table was sergeant frank