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and you are wearing a wire? yes. to solve that baffling case. a college student on a friday night out who vanished. she is a very shy girl. but she was something special. the possible suspects? just about everyone. the friend, the boyfriend. the mysterious older man. even her mom. i was shocked that they even suspected me. so why were police that a dead end? enter this guy. do you see things other cops don t say? phenomenal. they call him the evidence whisper. he was about to crack this case opened before your eyes. the answer was in the details? it was right there. and you won t believe how. i m thinking, i spoke to. it worked. i hope, i m not sure. hello. and welcome to dateline. 20 year old lynsie the told each other everything. or so her mother believed. when the college student vanished after a night out clubbing, nancy thought that she was at a sleep over with friends. and that wasn t the only thing that lynsie was hiding. ....
phenomena. they call him the evidence whisper. hello. the college student vanished after a night out clubbing. nancy thought she was out sleeping with friends. it would take years for detectives to uncover the truth buried in a pile of lies but could they find lynsie. here is the night lynsie disappears. reporter: sometimes the facts are as clear as the southern california skies. other times you have to know where to look to see the truth. this man has made a career of noticing what others do not. what s his reputation? meticulous investigator. pouring over the volume of evidence and finding things that other investigators did not find. the evidence whisperer? yep. reporter: does this man acts guilty or does he know more than what he s saying? what about this man, can you believe the story he s telling. i was supposed to pick her up twice, she was so out of character and did not show up either day. reporter: the evidence whisperer were not pre ....
we had no confession. we had no dna. reporter: 20 years went by. i still had to keep looking for what i had lost. reporter: but cathy had her. and she had him. i put a lot of faith in god. darren was his tool. and the killer? he never had a chance. this was everything to her. i fulfilled my promise. reporter: in the wee small hours of the morning, while the whole wide world is fast asleep, mary bennett is awake. not because she wants to be, but because some things stay with you, whether you want them to or not. and for mary bennett, it s the time 3:40 a.m. every day i wake up around that time. it s embedded in my brain. reporter: for the last 21 years, that particular time has stabbed her in the heart, pulled her awake. it s an internal clock, permanently set to the worst day of her life. it began with a phone call, then a knock on the door, and news of something that should never have happened to this family, to this girl. when she would come insi ....
reporter: 20 years went by. i still had to keep looking for what i had lost. reporter: but cathy had her. and she had him. i put a lot of faith in god. darren was his tool. and the killer? he never had a chance. this was everything to her. i fulfilled my promise. reporter: in the wee small hours of the morning, while the whole wide world is fast asleep, mary bennett is awake. not because she wants to be, but because some things stay with you, whether you want them to or not. and for mary bennett, it s the time 3:40 a.m. every day i wake up around that time. it s embedded in my brain. reporter: for more than two decades, that particular time has stabbed her in the heart, pulled her awake. it s an internal clock, permanently set to the worst day of her life. it began with a phone call, then a knock on the door, and news of something that should never have happened to this family, to this girl. when she would come inside the house, her favorite thing ....
dna. reporter: 20 years went by. i still had to keep looking for what i had lost. reporter: but cathy had her. and she had him. i put a lot of faith in god. darren was his tool. and the killer? he never had a chance. this was everything to her. i fulfilled my promise. reporter: in the wee small hours of the morning, while the whole wide world is fast asleep, mary bennett is awake. not because she wants to be, but because some things stay with you, whether you want them to or not. and for mary bennett, it s the time 3:40 a.m. every day i wake up around that time. it s embedded in my brain. reporter: for more than two decades, that particular time has stabbed her in the heart, pulled her awake. it s an internal clock, permanently set to the worst day of her life. it began with a phone call, then a knock on the door, and news of something that should never have happened to this family, to this girl. when she would come inside the house, her favorite t ....