they can visit in a jail >> here's kate snow with "bringing down bill cosby: andrea constand speaks." >> reporter: you may have seen her. but you've never heard her m speak.yo until tonight.ea >> andrea, you are now going to be known as the woman who took i down bill cosby. how do you feel about that?y. >> i never set out to -- to bring down anybody. and i haven't necessarily because i'm not alone. this is a collective consciousness and so i would rather say we brought down bill cosby, but i just had the shoes on. >> reporter: for thirteen years, through a civil suit and two criminal trials, the woman who confronted one of the country's most beloved entertainers, has remained silent, never speaking to the public about her case. now for the first time, andrea constand talks about bill cosby. >> for years and years and decades, he preyed upon young women. h >> reporter: about the assault. >> i was crying out inside, in e my throat, in my mind, for this to stop. and i couldn't do anything. >> reporter: and about her yt journey. >> why did you do this? >> for justice. >> reporter: we talk