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>> it was one of the eerie feelings when someone knocks on the door at 10:00 and 23450i9 and asked to speak to my dad. >> her brother was 13. they huddled on the staircase overlooking the front door. >> my dad collapse and screamed no, not bonnie. let her be in the hospital and let her be okay. >> bonnie craig, 18 years old. >> i remember my dad dropping to his knees crying on the front deck and that was the first time we had seen that happen. >> she was four time zones away. it was 2:00 when she docked and got the news that bonnie would not be okay. >> alaska state troopers said

Prosecutors would need more than dna to convict a killer. here's keith morrison. captions paid for by nbc-universal television >> reporter: many years ago late on a september night, a family in anchorage, alaska, got a knock on the door. >> one of those eerie feelings instantly when someone knocks on the door at 10:00 at night and asked to speak to my dad. >> reporter: 1994, samantha was 12, her brother adam 13, they huddled on the staircase overlooking the front door. >> we heard my dad collapse and scream "no, not bonnie." and i remember thinking, please let her be in the hospital and let he...

Dna. but prosecutors would need more than forensics to get a conviction. here's keith morrison. >> reporter: many years ago late on a september night, a family in anchorage, alaska, got a knock on the door. >> one of those eerie feelings instantly when someone knocks on the door at 10:00 at night and asked to speak to my dad. >> reporter: 1994, samantha was 12, her brother adam 13, they huddled on the staircase overlooking the front door. >> we heard my dad collapse and scream "no, not bonnie." and i remember thinking, please let her be in the hospital and let her be okay. >> reporter: bonner ...

It seems we hear less about how dna is used to track down the guilty. in a story you're about to see, a sample found on a murdered young woman was sent to the national database. 12 years after she was killed, it turned up a match. >> reporter: many years ago late on a september night, a family in anchorage, alaska, got a knock on the door. >> one of those eerie feelings instantly when someone knocks on the door at 10:00 at night and asked to speak to my dad. >> reporter: 1994, samantha was 12, her brother adam 13, they huddled on the staircase overlooking the front door. >> we heard my dad col...

DNA evidence is used to track down a suspect in a murder case.