my instincts are -- >> reporter: angelina tried to cast suspicion frank's friend and co-worker chad hollowaydn't believe her. and instead, enlisted chad to help set a trap for her. the idea is what here? >> see what kind of mistake she may make. >> reporter: they asked chad to call angelina while they listened in. she had done her best to put chad in the sights of law enforcement. now came his chance to return the favor. >> hello? >> angelina? >> yes. >> why did you tell the police that i poisoned frank with antifreeze? >> who is this? >> my main question, angelina -- >> how did you get my number? >> i want -- i'm wondering how in the world -- this could ruin my life. >> reporter: at one point you say, you are going to ruin my life. which actually, although it's maybe part of the script for that call, kind of true given what she tried to do to you before. >> it was. but inside, i knew that it's the other way around. you are not going to ruin my life anymore. it is your life that's going to be ruined because of this. >> you need to call the investigator. i'm ending this conversation. >> okay,

chad's place. it won't. >> holloway couldn't have done this. >> reporter: for the next 35 minutes, they try to get angelina to give it up. they lay out the facts. >> the only information, the only person that supplied any information that frank was poisoned was you. no one else. knew frank was poisoned. only you. only you knew oleander, in addition to that, antifreeze. nobody in this entire investigation told us about antifreeze. >> reporter: they tell her the poisons were still in frank's stomach, which meant he ingested them day after his return from angel gate. and within hours of his death. meaning angelina was the only one that could have given them to him. and detectives tell her while she thought she was playing them, they were playing her. >> this entire time, we have used everything you said and followed up on everything you have done and said. and quite frankly, it's hard to remember all those lies. >> reporter: angelina told them they were wrong. >> i didn't kill my husband. >> okay. you need to stand up. >> are you arresting me? >> yes. you are under arrest for the murder. >> no. i did