that moment? >> we didn't have enough yet. we wanted to go a bit further with this case. >> the police were about to see how determined dalia was to have her new husband killed. coming up -- >> our undercover tells us, hey, i'm going to put two shots to the head and it doesn't even faze her. no remorse. >> another undercover sting and a plan is set in motion for a deadly house call when "dateline" continues. when "dateline" continues it's just a cough. yeah right. and the earth is flat. ahhh!! treat your cough seriously with robitussin cf max. nothing lasts longer and treats more symptoms for your cough, cold and flu. robitussin. because it's never just a cough.