>> 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 present on either interview. watching them helps him solve the evidence. >> lynsie was the youngest of three. her mother nancy says he was always there. lynsie had a passion for animals. kim davidson remembers young lynsie has a compassion. >> i was freezing cold and a sweater came up around me and it was lynsie. she gave back in other ways. she struggles with her own disabilities, her left arm was paralyzed and left legs impaired. >> did she talk about how she became disabled? >> she brought it up to me that she was thrown as a little girl, very little. >> reporter: lynsie needed so much care and her mother was with lynsie like a shadow. >> in my life to make her as normal as she could be. >> reporter: by the time kim met lynsie, she remembers a tight family unit of just two. >> reporter: how close were lynsie and nancy? >> as lynsie reached adolescence, she changed the spelling of her name from this to this. after so many years of mom and daughter being each other's best friend, lynsie began to keep something in her life to herself like where she really headed one night in february of 2001. >> reporter: does it make sense she would lie to you of what she's going to do that night? >> i never known her to lie to me but you don't know what you don't know. >> reporter: she told her mom instead of their usual friday night dinner, she was staying with a friend named andrea. someone nancy never met and a young man named chris came to the door to pick lynsie up. >> reporter: she introduced you to this guy named chris. did he say hello to you? >> yes. >> i had a feeling about him. >> reporter: nancy spent so many years worrying about lynsie, it was a struggle to let go but she did. >> the last thing i said was remember your seat belt and she looks over and said back at you mom, love you. >> reporter: nancy locked up the house and went up to bed. the next day lynsie was supposed to call after she was done tutoring two girls from the neighborhood. when the call never came lynsie drove over and found out she was not at her job. >> all of a sudden she was not where she's supposed to be. >> reporter: nancy was frantic. i started calling the hospital and called the morgue, i wanted to see if there is a jane doe in the morgue. >> reporter: there was no jane doe. most people who disappear like that, they come back in a couple of days. >> if not 24 hours, yes. >> reporter: careen lumis, detective of the police department. >> reporter: you checked the e.r.? >> we checked everything. there were no signs as if she vanished. >> reporter: coming up. >> a week ago. >> reporter: when "dateline" continues. n "dateline" continues. when eye allergens attack, the itch can last 24 hours. but with pataday once daily relief extra strength you get fast, 24-hour relief in one drop. make it a pataday with the drop that's right for you. now without a prescription. everywhere. these are real people, not actors, who've got their eczema under control. with less eczema, you can show more skin. so roll up those sleeves. and help heal your skin from within with dupixent. dupixent is the first treatment of its kind that continuously treats moderate-to-severe eczema, or atopic dermatitis, even between flare ups. dupixent is a biologic, and not a cream or steroid. many people taking dupixent saw clear or almost clear skin, and, had significantly less itch. don't use if you're allergic to dupixent. serious allergic reactions can occur, including anaphylaxis, which is severe. tell your doctor about new or worsening eye problems, such as eye pain or vision changes, or a parasitic infection. if you take asthma medicines, don't change or stop them without talking to your doctor. so help heal your skin from within, and talk to your eczema specialist about dupixent. if your financial situation has changed, we may be able to help. i'll be observing your safe-driving abilities. play your cards right, and you could be in for a tasty discount. 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[ tires screech ] well, that came out of nowhere. advil dual action fights pain 2 ways. it's the first and only fda approved combination of advil plus acetaminophen. advil targets pain. acetaminophen blocks it. advil dual action. fast pain relief that lasts 8 hours. her daughter was missing. nancy ekelund began handing out flyers and counting the days without lynsie. she also went to talk with detective corrine loomis at the police department. nancy wanted corrine to know about her lynsie. nancy always knew where she was. they were best friends. it was a speech corrine loomis heard before. >> it is typical with a lot of parents or family members when they report a missing person, sometimes they give you the idea that this is an idealic family life because if they don't paint a rosey picture that we are not going to be sympathetic to look for them. >> reporter: that you are not going to look hard. they brought in the usual suspects like the boyfriend. >> his name is matthew ramirez, he was at college with lynsie, they had been on and off for a bit. >> when i went over to her house on thursday, she wanted to break up. >> reporter: what was off was soon back on. lynsie and matt were back together in time for the weekend but not in time to make plans for that friday night. >> reporter: then in came the last person to known have seen her, chris mcamis, out of school. he told the cops he was unemployed. lynsie met her from friends about four months prior. chris said that was a lie lynsie made up for her mother. the real plan was to go clubbing all night in san diego. >> she said don't tell my mom we are going to san diego because my mom won't let me go and definitely tell her. >> reporter: when their night of clubbing went bust, they headed home earlier than expected. he dropped off the early girls and headed to lynsie's house. it was after 4:00 a.m. when he got back. lynsie was worried that her mom maher his truck pulled up. that sounded strange to police until they heard from lynsie's friend that other times she had asked to be dropped off right here. >> reporter: chris said he then drove home and police found a photo from a bank atm of what looked like chris' truck heading north on the right street at the right time. to the cops, chris' story added up. that was when police learned matthew and chris were not the only man in lynsie's life. there were someone else. both matthew and chris mentioned to investigators, an older man who drove lynsie around. we heard lynsie referred to him as her friend. >> nancy had no idea lynsie was friends with any older man, she was about to find out. >> reporter: you got a phone call? >> yes. >> you are at your wit's end and the phone rang and it was a guy named marty. >> did you know him? >> no. >> reporter: he said he had money of lynsie that she needed for tuition. none of that made any sense to nancy. after lynsie goes missing. a guy named marty. >> marty rossler. >> reporter: what did he say to her? >> he says he's a friend of lynsie's and he's concerned because he had not heard from her. >> reporter: marty rossler was not marty rossler. he did not have a criminal record. what he did have was a relationship with lynsie that he had not told his wife about. marty was 58 and she was 20. >> reporter: they were boyfriend and girlfriend? >> don't think so. so police brought in marty. over two days they recorded those interviews and at times on videos and at times just on audio tape. >> when was the last time you saw lynsie? >> a week ago. >> no, i don't think so. >> absolutely not. marty said he last seen lynsie the day she went to san diego on that friday. >> reporter: did you believe him? >> we didn't believe him. >> reporter: they received a tip. she seen lynsie with a much older man who matched marty's description together at her store after the day lynsie went missing. >> i was not there on that day. i had been on that store and i am like you, i am easily identified and probably every place i have been with her would know that i was in there with her. >> it was a long interview. >> reporter: friendly? >> no. i remember drilling down on him because i thought he may know where lynsie was. >> reporter: you're a parent? >> yes. >> how many kids do you have? >> two. if you have a child vanished and vaporized in thin air, would your heart not be broken? >> absolutely. >> do you not feel some compassion for nancy? >> unbelievable. i think this is a nice girl and you know this family had a share of hardships. this is just -- i feel so helpless. >> i don't think you are helpless, i think you can help us. >> marty insisted that he could not. detectives were not buying it. >> never touched her. >> have you put her some place where she's left? >> no. >> reporter: police searched marty's home and found nothing. no proof that marty had anything to do with lynsie's disappearance so they move onto a new suspect, someone closer to lynsie than anyone else on earth. "dateline" returns after the break. 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>> we did look at lynsie's mother. we have to. >> i made cookies. >> reporter: the cops were not coming with a coffee. they arrived with a search warrant and shovel and dogs. >> i didn't know what a search warrant was. the house nancy and lynsie once shared was torn apart. i don't know if nancy was on the radar for the long time. it was long enough to be able to set her aside. >> reporter: after that search they did just that. they believe this anguished mother had nothing to do. they took nancy off the list and nancy's boyfriend. he had an alibi putting him some where else at the time lynsie went missing. that left just two. >> i have not seen her since that day, marty, police did not trust because of his secret relationship and he lied about his identity and the man who dropped lynsie off at that quarter. the last person to see her before she vanished. chris mcamis. april 2002, more than a year after lynsie went missing, detectives decided to start over, they brought chris mcamis back to see if his story still held up. >> police turned up the heat. >> reporter: police thought chris seemed oddly calm talking about a calm who may have been murdered. >> if it turns out somebody killed her -- find them. >> reporter: that's as strong as we can get out of him? >> that's as strong as we can get out of him. >> i personally executed. she was my friend, there was nothing. >> reporter: his lack of emotions suggested that chris should move to the top of the list. but, it was not evidence. after the interview chris mcamis was free to leave. detectives were not closer to learn what happened to lynsie ekelund and neither is nancy. you thought one day she would walk back through the door? >> yes. >> reporter: she believed it because she wanted to and because over the years several people have told her they seen lynsie. >> they never saw the front of her face, they saw the back of her and ill held onto every word they said. >> reporter: it was torture for nancy no matter what word of events. >> reporter: nancy feels -- >> nancy was pretty angry, we have worked this case diigently and at some point you hit the wall. >> reporter: at the time nine detectives working on everything, drugs, gangs and cold cases. 2008, detectives pd would hit that wall. they needed larry. >> reporter: tell me about larry. >> he's phenomenal. >> reporter: because he sees things other cops don't see. >> because he sees things, cops don't see. i don't know anybody could have done a better job than larry. >> reporter: the evidence whisper was about to listen to the facts of this case were saying. >> was there something police have missed? you bet. that picture of the truck spotted on the night of the crime, something about it does not seemed right but the evidence whisper is all over it. when "dateline" continues. it. when "dateline" continues. hpv can cause certain cancers when your child grows up. get in its way. hpv can affect males and females... and there's no way to predict who will or won't clear the virus. but you can help protect your child by taking a first step. the cdc recommends hpv vaccination at age 11 or 12 to help protect against certain cancers. hey cancer! not... my... child. don't wait... talk to your child's doctor about hpv vaccination today. before nexium 24hr, anna could only imagine a comfortable night's sleep without frequent heartburn waking her up. now, that dream... . ...is her reality. nexium 24hr stops acid before it starts, for all-day, all-night protection. can you imagine 24 hours without heartburn? for all-day, all-night protection. 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>> reporter: by 2008, lynsie ekelund have been missing for seven years. cold case unit at the orange county da's office to a guy named larry montgomery. with more than 30 years working homicide. larry put away his share of bad guys and not usually by knocking on doors, instead larry works by looking closely at the evidence. he does not work fast. in fact, larry is meticulously slow and that was just what this cold case needed. >> reporter: was there anything in the original investigation that struck you as something you needed to re-examine? >> everything. >> reporter: everything that led police into that wall trying to decide between two suspects. >> i am concerned about this girl and she's missing. >> reporter: marty, lynsie's older friend who kept their relationship a secret and chris. the last person known to have seen lynsie when he dropped her off at that corner. >> reporter: any idea which of those two are a likely suspect? >> no, i don't know until i got into the details. >> reporter: you got reputation of god's in the details. >> reporter: guilty or innocent? was it marty or chris? larry considered another possibility. could it have been random? someone who seen lynsie at just the wrong time? >> so you got a bad guy just waiting and hoping a girl drops out of a car at 4:25 in the morning. >> reporter: it happens. >> and you consider that and you weigh it. is it a good possibility? probably not but still, keep an open mind. >> reporter: larry sat down and read through the entire case file, all the witness statements and interviews. he did that for two years. he watched the february 2001 interview with an unhappy marty. >> reporter: did it strike you as suspicious that marty would call and talk to lynsie's mother and gave a phony name. if you did not know the background of marty then absolutely. >> when i talked to the mother, i just gave an identification. marty rossler. >> which is a lie. >> i don't want my wife to be brought into this thing. >> reporter: larry took a closer look at the idea that marty and lynsie were together at the clothing store after she went missing. >> she was not there on that day. >> reporter: no one found any security video of that and larry learned over the years that well-meaning people often gets dates wrong. marty participated in those early searches for lynsie. >> you eliminated marty quickly? >> yes. marty's behavior matched of not the guilty one. >> reporter: he's searching. larry montgomery turns his attention to chris mcamis, guilty or innocent? >> chris was the last person known to be with lynsie. he told police he discover straight home after dropping lynsie off. he found that photo took him past this atm camera. >> reporter: the video saw that chris was telling the truth and suggested what he said he actually did. when larry compares photos of chris' truck with the photo at the bank, he saw something no one else noticed. the pink on the backside mirror of chris' truck was white. the truck in the photo had a dark spot. whatever mirrors were there, they were black. it is not the same truck. suddenly, chris' alibi had a big hole in it. larry moved on with his history with women. two ex-girlfriends talked to police about how unhinged he is with women. he thought the crab had killed one of his fish. >> reporter: this is a guy with significant anger issues. >> it certainly appears that way. >> reporter: larry listened to chris' interview and caught him talking some of the time about lynsie in the past tense. then larry found something in the paper work, the proof that chris mcamis lied about his whereabouts, the day that lynsie did not came home. larry checked chris' credit card statement. >> there was one entry on february 17th and it turns out it was santa clarita which was 50 miles north of where chris lived. >> reporter: larry found information of chris' dad that she was in construction and in 2000 and 2001, he had a job site in santa clarita. chris told police he did not work for his dad and he was unemployment. larry saw some big cash deposits in addition to his unemployment checks. larry came up here to ask around. >> reporter: chris' father did some of the tractor work at that site and chris worked there. chris was one of the tractor drivers. >> reporter: is this where you thought yourself that's where lynsie ekelund is? >> i thought the chances are excellent. if i killed lynsie and i had use of a tractor out in the middle of nonowhere, i may use that tractor to dig a hole to put her in. >> reporter: an under cover operation. >> reporter: were you armed? >> yes? >> reporter: and you were not wearing a line? >> yes. >> when "datelines" continues. 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>> jeans on and a littl little t-shirt. >> are you chris? >> my name is nicole anderson. >> reporter: the officer was posing as a student reporter, complete with a phony pass, she talked to a student reporter from lynsie's college about the case. >> reporter: you used your real name? >> no. i used a fake name. they believe remains found belong to lynsie, in the meantime i am supposed to contact friends and family to get initial story and reaction. >> when i told him that police found lynsie's remains, his demeanor changed. >> reporter: police had not found her remains and that was a lie. police do it all the time. larry tried to find lynsie up at the construction location where chris had worked but we not nothing more. >> reporter: down the street from chris' house was listening and keeping an eye on the action. so you are watching him? >> yes, i was sitting ten houses down and watching the reporter. once she left the area, we were in business. >> reporter: what happens? >> he was seen coming out of his house and going into the garage and we are talking about 3:00 in the morning. it was clearly a sign of somebody who could not sleep. >> reporter: detectives were sure they rattled the suspect. they trailed chris the next day. at some point it was apparent that he knew we were following him. they broke off surveillance and brought chris in. >> chris, have a seat. >> reporter: larry looked at tapes of every time chris had been in for an interview. today he and chris were going to meet for the first time. >> i have been investigating this case for about two years now. larry had a plan to get chris to talk without asking for a lawyer. >> you may want to know what's going on and why you are sitting here. larry promised to fill him in the case, thinking if the cops had the goods and maybe he had something to say. >> i have to advise you of your rights. after tharks what i would like to do is explain to you everything. >> reporter: larry read chris' rights. larry laid out his case. he knew chris never dropped lynsie off that night because the atm photo that it first fooled investigators actually provered chris was not there. >> it was not your truck but for years it was spotted your truck but your fact did not have the light. all of a sudden a big reflex. you were working. he said you guys don't work on saturday. lynsie disappeared on a saturday morning. none of your credit card usage was up there except for the day that lynsie disappeared. now we got lynsie up there right near where you work right at the time where you did not drop her off and we have enough proof. and knowing of chris' anger issues, larry summed up a little empathy to draw chris in. >> i know you have the ability to be angry. i don't know what could caused her to get you that angry. >> chris did not say much until a little body language revealed that larry was on the right track. >> was it a premeditated thing? >> i didn't think it was. what did she do? larry finished talking. he was hoping chris would give it up. >> i need a lawyer to talk to about this with me. >> well, it is up to you. the supreme court made it clear that if someone declares they want an attorney, the interview is supposed to stop until one could be hired or provided. larry was walking a lie, believing asking for a lawyer is not the same when you need one. >> that's as close as you can get. >> reporter: were you holding your breath when he said that? >> yes. if he did not confess, he was going to walk again. "dateline" returns after the break. 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[music: “you're the best” by joe esposito] [music: “you're the best” by joe esposito] [triumphantly yells] [ding] don't get mad. get e*trade and take charge of your finances today. so you're a small business, don't get mad. or a big one. you were thriving, but then... oh. ah. okay. plan, pivot. how do you bounce back? you don't, you bounce forward, with serious and reliable internet. powered by the largest gig speed network in america. but is it secure? sure it's secure. and even if the power goes down, your connection doesn't. so how do i do this? you don't do this. we do this, together. bounce forward, with comcast business. i need to know what you did. larry montgomery spoke for 45 minutes. given chris amis everything he had. >> take a look at the credit card usage. >> reporter: the photo and the job site. >> the phony story about finding the body and the interview had suddenly stop dead. >> i think i need a lawyer to talk to about this. >> well, it is up to you. >> because chris said "i think i need a lawyer," larry thought whatever came next would be admissible in court. >> detective angel let larry do the talking and spoke up. >> it interjects something quickly. >> in this case, that's the way it is pointing. >> nobody is going to be able to speak for you. >> there is a reason that everything happens. >> i am sure there are circumstances that happened that night. >> he kind of sighed and he laid out a story. >> all right, what happened was -- >> suddenly you realize he was going to give it up. i reached over and grab his arm and says he was going to confess. it was sad and ugly. she -- i was going to take her home. >> okay. >> she was telling me why don't we sleep at your place because i don't want to upset my mom. >> makes sense. >> reporter: as larry suspected, chris never dropped off lynsie. i was trying to kiss her and she elbowed me in the chest and i went to my kitchen in my apartment and i drank a lot of vodka and i went back and tried to do the same thing. she pretended to be asleep and i pulled her pants down and i was totally drunk and she got up and said oh my god what are you doing, i am calling the police and when i got up and walked to her, she tried to knock me out with my phone with my home phone. >> like this to my face. >> okay. >> and being drunk, it enraged me that set me on fire. and i grabbed her and you threw her onto my bed and i got her into a head lock and she died. >> then what did you do? >> then i try to figure out what i should do because i could not believe how it happened that way. >> i could not believe it. i thought she was going to pass out. i ended up killing her. >> that was it. she had been killed before anyone realized she was even missing. >> chris drove up to the work site and dug a hole. he held out to her body for a few days and when no one was around he buried her. >> reporter: did it feel better to know? >> there was a relief but i was not happier because of it. >> reporter: after the confession, detectives left chris in the interview room with another detective to watch him. chris could not stop talking. >> unbelievable. >> it has been so long. >> finally, it feels better when you finally just say what you were supposed to say, you know? >> i know my life is ruined now. do you know i am going to get the death penalty for this? >> reporter: then larry came back and all was meticulous, he was not done. he wanted that final detail. where exactly chris had left lynsie? he explained to chris even though they found her remains which was not true, the grave site shifted over the years from flooding. with the detective, chris returned to the site which had been lynsie's final resting place. >> this tree did not exist there. >> okay. he was not sure of the exact spot. >> it is over in this vicinity. >> way up there or all the way into that brush. >> reporter: it took more than a day of digging to find what was left of lynsie. first they found her shoes and a jacket and a bracelet. that's how nancy knew they found her. the coroner confirmed it using dental records. two years after he confessed, chris mcamis pleaded guilty to second degree murder. he's sentenced to 15 years to life. >> you told me that you let this consume your life too much? >> it does until this day. >> reporter: now it is over, what are you going to do? >> i don't know. >> i knew life is opening up and i don't know. i don't have any answers. i just have to get over this. i'm craig melvin. >> and i'm natalie morales. >> and this is "dateline." >> she was beautiful. her eyes were just remarkable. i was going to be there for her and she was going to be there for me. it didn't matter what it was. i thought that maybe she'd been kidnapped. no one knew what was happening. there's nothing i could have done or anyone could have done. >> skylar, rachel, sheila. total bffs. >> they hung out all the time. >> you thought of them as a team. >> the three of them became

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