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>> this guy was going to get killed. >> ooand then it happened. her new husband murdered in their townhouse. >> she needed to get to the house fast. >> was this crime all that it seemed? >> she played such a good game that people didn't know. >> a surprise was coming. >> you don't know what to think. >> and it would arrive from beyond the grave. >> there has not been a story like this ever. is she the villain? is she the victim? who knows? that is what makes her riveting. she is infamous and probably will be forever. >> the sting. hello and welcome to dateline extra. i'm craig melvin. what s...

>> reporter: and so -- more than seven years after dalia dippolito was charged with hiring a hitman to kill her husband, she would go on trial again. >> when she heard the news that she had been granted a retrial, she was extremely overjoyed because she felt like she would have a second chance to have the truth be told. >> reporter: she would speak exclusively to "dateline." and oh, what a story she'd tell, this real housewife of boynton beach. so much better than reality tv. coming up -- >> i just started manufacturing all of these things. >> did you want to have your husband mike dead? >> ...

Welcome back. dalia had gone to the gym one morning and returned home to what seemed like a nightmare. police were outside her florida condo with news that her husband, mike, had been killed. but there was more to the story. much more. turns out detectives already knew quite a bit about dalia thanks to a tipster and an elaborate hidden camera investigation. here is dennis murphy with moore. >> dalia had been called home from the gym to be told by police that an intruder had murdered her husband michael. >> sorry to tell you, ma'am, he's been killed.

Who posed as her hitman. >> put your head up and look at her. >> put your head up. >> i've never seen him. >> i'm watchin'. and i am just watching and i'm waitin' for her to give it up. and you know what? the girl never gave it up. >> we're going to go ahead and arrest. >> reporter: dalia was arrested and handcuffed. and cameras were still rolling when police walked a very-much alive michael into the doorway of the interrogation room. >> oh, my god. >> he's alive. >> and they say, "you know this guy?" and i'm standin' there, probably from twice the distance of us. >> come here please. come her...

Not the stipulatipster he story credible, a life was on the line. so the detectives enlisted mohammed as a confidential informant and gave him a story to tell his part-time lover, that he found her hitman who could pulling off the job can be. >> either this guy was lying to us or it was true. we hadn't valley dated tu hadn' information yet. >> the car that he drove to the gas station meeting point had been rigged by police technicians for pictures and sound. undercover agents nearby would be watching the whole time to find out who this woman was, where she lived, who her husband was and just w...