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>> detective moreno had the tipster run his story down from the top. the man was name it mohamed, and he said he was a part-time actor who worked at a convenience store. as he told it, he had been friends with benefits with a woman for years. they had met for the occasional casual sex. then, she asked him for help in finding a but hitman to kill her husband. >> he says, you know what? im sleeping with this guys wife. but, at the same time idle this guy to be killed. and that was his concern. he ...

Wife and now shes trying to get somebody to kill him. >> pretty juicy story. >> exactly. >> the detective had the story run the man down from the top. mohammed said he was a hart time being part-time actor who worked at a convenience store and was friends with benefits for years. and then she asked him for help in finding a hitman to kill her husband. >> he said im sleeping with this guys wife but at the same time, i didnt want this guy to be killed. >> but the detective wondered if he was being...

Richness is right there. how can they get a piece of it. >> they lived in a high end condo, fine for two up and comers. they had big dreams like any couple young and in love. aspirational at the very least. she had a $20,000 diamond eng e engagement ring. he had a porsche in the garage. their story for public consumption, the g rated version, was love at first sight. mike was an internet entrepreneur and dalia the business woman he fell head over heels for. three months after their first meeting...

>> find out who he owed suggested dalia and youll find the killer. the cops listened, but changed the focus of their questioning to the couple themselves. dalia and michael, the newlyweds of six months. >> were fine, like theres nothing. >> no problems between you guys. no financial problems no -- >> no, theres nothing. his business had slowed down, you know. >> but the cops were toying with dalia. they thought they knew so much more about the nudely wedding whos. did they ever. lets freeze the ...

>> running down the license plates and registration yield the name of a 26-year-old woman, dalia, the same woman who would later be seen on videotape grieving widow. police officers didnt have to wait long for confirmation. the woman really appeared to be in the market for a trigger man. >> less than a minute or so, she begins talking about hiring somebody to kill her husband. >> hes not doing dental work to get the story out. >> which shocked us. >> the meeting seemed to be all business. dalia ...

>> 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 didnt know. >> a surprise was coming. >> you dont 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 pro...

>> 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 shed tell, this real housewife of boynton beach. so much better than reality tv. coming up -- >> i ...

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 ...

Who posed as her hitman. >> put your head up and look at her. >> put your head up. >> ive never seen him. >> im watchin. and i am just watching and im waitin for her to give it up. and you know what? the girl never gave it up. >> were 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. >> hes alive. >> and they say, "you know this guy?" ...

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 hadnt 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 watch...