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Discovered it in the wheel well of sam s pickup. police also found evidence that both danielle and michael were taking surveillance photos of sam and dianne. this is a photo taken of them on sam s boat. in this one, they re on dianne s balcony. michael would have been somewhere across the lake there. and that s where he would have been hiding in the bushes. it seems like a perfect spot, actually, if you wanted to spy on someone. absolutely. reporter: but detectives said the couple only got bolder from there. they discovered evidence michael had brazenly broken into dianne s apartment and videotaped the inside. inside the belly of the beast. he s narrating. i believe his first words were, i m in the belly of the beast. and his first thing when he pans was of the alarm pad where it wasn t armed. that could have been bad, huh? reporter: as michael documented every aspect of dianne s personal life, poking around her drawers, her refrigerator, even inside her bathroom. polic ....
we have been not getting along for many months. reporter: danielle also explained that she knew sam was having an affair, despite sam s best efforts to conceal it. did you know where he went today? today, i m sure he went to his girlfriend s, yeah. but he always goes to her house. i m not surprised by that. reporter: danielle then admitted that she too was unfaithful. she was pretty straightforward, told me about the affair. it was wrong. i shouldn t have done it. nobody should cheat. reporter: little by little, the detectives led danielle to believe they were focusing their investigation on her lover, michael. so it would kind of shock you if michael went and confronted him? yeah. that s what happened. really? and we have michael. do you? reporter: it wasn t the reaction the detective was expecting. he found danielle s tone to be strangely flat and unemotional. that was troubling to me. that was disturbing to me. i cannot believe he did this. report ....
After all, michael shot sam not once but four times. one of the shots was to the back of sam s head. reporter: so sam is laying here, and michael is right on top of him, basically, giving him the final shot? he would have had to have been. that s what the evidence indicates. one shot might have been an accident. not the three or four shots that he actually fired. that was no accident at all. reporter: but detectives wanted to know, if this wasn t an accident, why then did michael shoot sam? you had all these pieces to the puzzle and you tried to fit them all together. reporter: that s when michael revealed something that would turn the case on its head. he told detectives about an affair, but it wasn t the affair between sam and dianne. it was an affair he was having with the victim s wife, danielle dreher. they had been having an affair for four years. reporter: it was a mind-spinning moment. detectives had just discovered the victim, sam, had been cheating on his wife ....
reporter: and challenging for detectives, who now had to contend with a second affair. michael minor, the plumber, 13 years younger than danielle, told them the two had met on ashley madison, a website for husbands and wives looking to cheat. the website s slogan life is short, have an affair. this was someone looking to have an affair. reporter: they both were. yeah. reporter: but michael insisted this was no casual fling. after all, the affair had lasted four years. what s more, he told detectives he had fallen in love with danielle. it was like i really found my soulmate, man. it was so wonderful. i really had every intention of marrying this girl. he was smitten. i mean, he was totally obsessed with her and in love with her. reporter: he went on to say that on the day of the shooting, he decided it was finally time ....
Lookout. in this text message to michael, danielle wrote, get outta there if you aren t already. getting bad feeling. he s doing it at the request basically of danielle. reporter: but what detectives found most alarming were the text messages michael and danielle sent each other. michael minor writes, i want to blow his head off and then put two on her just for good measure. he goes on to say, bang bang, done. i won t though because it s wrong . danielle later responded, you would not and could not because that would be illegal. that was definitely disturbing. reporter: in another text danielle referred to her handgun, which she called daisy. she wrote, i am so close to introducing them both to daisy. michael responded, haha we can do it together! as a date. smiley face. in yet another, she wrote, i hate them with every inch of me. revenge will be mine and it will be very, very sweet. ....