Sarah Murnaghan , 10 , walks with the assistance of a therapist , walker . Hide Caption 3 of 11 Photos:Photos: 'Walking Dead' star on set ' Her quest for a transplant prompted a change in national policy .
Sarah Murnaghan , 10 , walks with the assistance of a therapist , walker . She received new lungs in June . Her quest for a transplant prompted a change in national policy .