Article continues below advertisementThe father of a girl abducted from a slumber party and later found dead in a shallow grave two months later said the search for Nancy Guthrie has brought back terrible memories. "It's triggering," Marc Klaas, told CNN's Kaitlan Collins on Thursday, February 12. "It's triggering because there are so many similarities between what happened in our case and what's happening here."Klaas' 12-year-old daughter, Polly Klaas, was kidnapped during a sleepover with two friends at her mother's house in Petaluma, Calif., on October 1, 1993.