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>> i did, yes. we started getting people following our page. >> where was she? what was behind this? far from home early. >> i saw the tattoo and i said, that's her tattoo, isn't it? >> and three caught on camera clues. someone's in her car. someone's at her back. but, most jaw-dropping of all, someone is up onstage with a song turned sinister. >> i couldn't believe what i was hearing and seeing. >> could karaoke be a key to this case? >> my heart was pounding and pounding. >> i was sweaty and nervous. we need to figure this out, fast. hello, and welcome to dateline. 29 year old carr...

whole community. >> it hit her town like a lightning bolt. the strange disappearance of carrie olson. >> it was scary. everyone loved carrie. >> it was so painful. >> you reach out to dateline. >> i did, yes. >> we saw young people following our page. >> where was she? what was behind this? far from home, a lead. >> i saw the tattoo, and i said, that's your tattoo, isn't it? >> and three caught-on-camera clues. someone is in her car. someone is at her bank. but most jaw-dropping of all, someone is up on stage with a song turned sinister. >> i couldn't believe what i was hearing. insa...

that's your tattoo, isn't it? >> and three caught on camera clues. someone is in her car. someone is at her bank. but most jaw-dropping of all, someone is up on stage with a song turned sinister. >> i couldn't believe what i was hearing. insane. >> could karaoke be a key to this case? >> my heart was pounding and pounding. >> i was sweaty and nervous. we need to figure this out, fast. hello, and welcome to dateline. 29 year old carrie olson was the girl next door, bubbly and bright, with close friends and a new man in her life. she had everything ahead of her, and then she vanished. ...

>> so, you knew exactly what time tim had been here? >> exactly. >> correct. >> the big lots in la crosse as a three hour drive of highway 61 from the tobacco outlet, and it turns out, the shovel was purchased exactly three and a half hours after mcvay block that cigar. >> that was huge for us. you leave the tobacco outlet, which is the exact amount of time to get to la crosse, wisconsin. >> but detectives still needed something more concrete to connect mcvay to the purchase of the shuttle. >> so, then we asked for the actual sales receipt. >> on the receipt, not only the shovel, but a black b...

Outlet in the quad cities. you knew exactly what time tim was here and where he was going? >> exactly. >> a three and a half hour drive up highway 61 and the shovel was purchased exactly 3 1/2 hours after mcvay bought that cigar. >> you leave the tobacco outlet which is the exact amount of time to get to wisconsin. >> detectives needed something more concrete to connect mcvay to the purchase of the shovel. >> then we asked for the actual sales receipt. >> on the receipt was not only the shovel but a black bag. >> a black bag. >> a desage travel bag. it cost only $10 but the big payoff that pol...