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>> hello. i'm ann canning. and this is dateline. -- >> told me he love me. i loved him -- he said he'd be back. >> i'd hear a motion of some sort. and then i remember, hearing gunshots. >> -- one there. >> it's the website where -- to meet and cheat. >> it's someone looking to have an affair. >> but this affair was about so much more defeat. >> -- the affair became a game, a wife and her -- spying on her husband and his lover -- >> you just think, what have they done? >> and that the spy spot turned deadly, one of the four lovers gunned down. >> it obviously -- was random. waiting at...

i told him i loved him. he said he would be right back. i could hear a commotion of some sort. and then i remember hearing gunshots. looking to see him lying there, it was bad. >> it's the website we're lovers go to meet and cheat. >> this was someone looking to have an affair. >> but this affair was about so much more than deceit. >> you couldn't write this as a movie. you couldn't write this as a book. >> this affair became a game. a wife and her lover, spying on her husband and his lover. >> you just think, well what else have they done? >> and then, this by game turned deadly. on...

Cheating on his wife, danielle. now they were learning danielle had also been cheating on sam. >> everybody here is involved with somebody else. it was interesting to say the least. >> 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. >> they both were. >> yeah. >> but michael insisted this was no casual fling. after...

Sure. after all, michael shot sam not once but four times. >> one of the shots was to the back of sam's head. >> 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 not accident at all. >> but detectives wanted to know if this wasn't an accident, why then did michael shoot sam? >> got all these pieces to the puzzle and you try to fit them all together. >> that's when michael reveale...

One of my brother's supposed fire brothers. >> reporter: what's your advice to this guy, this firefighter? >> watch your back, you know. the last two guys involved with danielle, one's dead, one's in prison. >> reporter: as for dianne, she's now left to reflect on a life with sam that could have been. did you two talk about marriage? >> yes. >> reporter: and was that in the cards? >> oh, absolutely. >> reporter: did you ever feel like i'm being punished for having this affair? >> oh, yes. i might have said those exact words myself. >> reporter: it all started in a club with an innocent convers...