mike narduzzi: there's a white female body in the back seat. police knocked on the door at 9:30 the next morning. i think i fell to my knees. hank winchester: and one of the neighbors said, well, i do notice men and women dressed in leather carrying whips. this is a guy with a secret life. woman 2: i had never, never heard of such things. mike narduzzi: it appeared to be a relationship based on mutual obsession. woman 2: there's no doubt in my mind that she knew what her husband was into. about his kinky taste? she knew. dennis murphy (voiceover): follow the twists and turns in one of the strangest stories we've ever had on "dateline." i first met him on an adult website. it was layer after layer after layer. marc santia: get ready, because now everything just started spinning. [no speech] urphy (voiceover): if you ever needed to be persuaded that bad things, grotesque things can happen anywhere, then take a journey with us to detroit in the wealthiest of suburbs. marc santia: it's sort of "the truman show." it's sort of "wandavision." it is th

mike narduzzi: he told us that he was wearing these boots and that he got rid of the boots. he told us that he dropped these boots into a clothing donation box. narrator: detective narduzzi says they tracked down the boots and sent them off to the lab for testing. her dna was on the bottom of those boots. so his story is corroborated on a major point right there. yes. narrator: but the boot wasn't the only source of dna evidence. gentz told investigators that jane fought for her life during their struggle and showed the cops the scratches to prove it. which is common with struggles. if someone's assaulting somebody and there's a struggle, you get the assaulter's dna under the victim's fingernails. and the victim had a broken fingernail and there was traces of joe gentz there. correct. narrator: after nearly a month long investigation to corroborate gentz's confession, authorities finally felt they had enough to make a move, but only on gentz. marc santia: joe was supposed to have a hearing for an unrelated his daughter. we were there. we were talking to joe. and we had no id