NEW : ` > > DNA tests confirm that the alleged captor is the father of 6-year-old , official says . Authorities board up his Cleveland home to preserve the crime scene , police say . Castro is on suicide prevention in a 9-by-9 foot jail cell , spokesman says .
NEW : `` It 's so upsetting , because he was so close , '' Castro 's neighbor says . DNA tests confirm that the alleged captor is the father of 6-year-old , official says . Authorities board up his Cleveland home to preserve the crime scene , police say . Castro is on suicide prevention in a 9-by-9 foot jail cell , spokesman says .