Cassidy has grown. her father, her mother, snatches of memory ever farther away. that s all for this edition of dateline extra. i m craig melvin. thank you for watching. msnbc takes you behind the walls of america s most notorious prisons. into a world of chaos and danger. now the scenes you ve never seen. lockup: raw. three unforgettable inmates. each one about to cross the threshold to freedom. look back, you come back. this time i m not looking back. we witness their joys. ....