that's all for this edition of "dateline extra." i'm craig melvin. thank you for watching. g melvin thank you for watching -- captions by vitac -- www.vitac.com i can't believe that your baby's lying there lifeless. >> she was everything to me. she was so sweet to everybody. >> state troopers said bonnie had died in a hiking accident. >> they said she fell off a cliff. her mother said they were wrong. >> i was screaming to them, these are defensive wounds. >> no witnesses, no weapon, nothing left behind but a stranger's dna. >> we no longer have some accidental death. this was a homicide. >> they had no suspect, but for years her mother kept fighting to find bonnie's killer. >> bonnie's mother continues her