NEW : ` > > NEW : FBI pledges `` a thorough and complete investigation '' into 1964 baby kidnapping . Paul Joseph Fronczak , now 49 , tells KLAS he was n't the kidnapped Chicago baby . Fronczak wonders `` how old I am , or who I am , or what nationality ''
NEW : `` I believe that we will solve these 2 tragic mysteries , '' Fronczak texts CNN . NEW : FBI pledges `` a thorough and complete investigation '' into 1964 baby kidnapping . Paul Joseph Fronczak , now 49 , tells KLAS he was n't the kidnapped Chicago baby . Fronczak wonders `` how old I am , or who I am , or what nationality ''