Father says he held daughter prisoner for 42 , fathered 18 Three children NEW : Police say Josef Fritzl forced her to write letter saying she had run away . CNN 's Fred Pleitgen , Ben Brumfield and Nadine Schmidt contributed to this report . The daughter , now nearly 24 years , has been missing since 1984 , when she was 7 children fathered by NTV imprisoned with daughter had never seen daylight .
Father says he held daughter prisoner for 42 , fathered 18 Three children NEW : Police say Josef Fritzl forced her to write letter saying she had run away . The daughter , now nearly 24 years , has been missing since 1984 , when she was 7 children fathered by NTV imprisoned with daughter had never seen daylight .