today we sat down with mark klaus who has never run from the murder he told us it has given meaning tois life. >> i don't forget, and i don'ting forrive. >> -- forgive. >> mark klau is moved on from pro found personal tragedy, a person with reminders on walls and shelves of his home and heart. >> m my mind she's a 12-year-old girl. i think about high school graduation. getting married. starting her own career. having her own children. of of course i think about those things. >> especially now. october 1 will mark the 20th anniversary of her abduction from a slumber party in her bedroom, an abduction in front of friends that led to her death. >> he had a knife and threatened them. he tied them up and gagged them. and then, he left with the victim. >> polly may have been the perfect little girl next door. maybe that is why petaluma came out in force to look for her. not tens of people or hundreds but thousands. >> if it was our daughter... that we, you know we'd want people to be out looking for her. >> bring her back. don't hurt her. bring her back. >> it was not to be. and painfully so