Police, medical professionals and those who know Josef Fritzl are struggling to piece together how he led a double life for more than two decades in a small Austrian town.
Those who knew Fritzl describe him in such contrasting terms -- friendly, reclusive, arrogant, a kindly grandfather -- that it seems no one really knew him at all.
At his home on Ybbsstrasse in the quiet town of Amstetten, east of Vienna, the 73-year-old retired electrician lived with his wife, Rosemarie, and the three children he has admitted to fathering with his daughter. 
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CNN's Frederik Pleitgen contributed to this report.
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