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If i can solve this, i can probably put the whole thing together. >> the anomaly -- well, that would be the puzzling piece of evidence which haunted investigators for almost two decades, that odd oblong hunk of foam. >> i knew it was either going to come from robin, the victim, or it was going to come from the suspect in the case. and once i was comfortable that this didn't come from robin's purse, it didn't come from robin's clothing, it's not part of kentucky fried chicken's restaurant, it doesn't belong there. >> which left only one other possibility -- the murderer. wallace pored over the ...

As a father because he didn't protect her. he didn't keep her safe. >> our dad would sit at the edge of his bed and just think about robin and wait for her to walk down the hall every day. >> of course, they didn't know, none of them did, that the solution was sitting right there hidden in plain sight until someone closed the lid and filed it all away. coming up -- nearly 20 years would go by without a break until a fresh pair of eyes focused on one particular photograph and saw something new. >> it couldn't be. it couldn't be. >> when "dateline" continues. >> when "dateline" continues

>> soon the shannons became six, with the birth of their two boys. and in 2000, david took the family south to fayetteville, when he was transferred to ft. bragg. >> david loved the military. he loved being the soldier. you talk about somebody having a first love or something they loved more than anything. he loved that uniform. >> and the military had been good to david. he was major shannon by now, well on his way to becoming a colonel. and that was the phone call the shannon family was really looking forward to from ft. bragg. not the one they got that devastating morning in july 2002. >> t...

He didn't keep her safe. >> our dad would sit at the edge of his bed and just think about robin and wait for her to walk down the hall every day. >> of course, they didn't know, none of them did, that the solution was sitting right there hidden in plain sight until someone closed the lid and filed it all away. coming up -- nearly 20 years would go by without a break until a fresh pair of eyes focused on one particular photograph and saw something new. >> it couldn't be. it couldn't be. >> when "dateline" continues.

Would be the puzzling piece of evidence which haunted investigators for almost two decades, that odd oblong hunk of foam. >> i knew it was either going to come from robin, the victim, or it was going to come from the suspect in the case. and once i was comfortable that this didn't come from robin's purse, it didn't come from robin's clothing, it's not part of kentucky fried chicken's restaurant, it didn't belong there. >> which left only one other possibility -- the murderer. wallace pored over the pictures of marshall after he was pulled over and suddenly a light went on. >> he's wearing his ...