>> the terrorist attacks at our diplomatic compound and later at the cia post in benghazi libya on september 11th, 2012, took the lives of four brave americans. ambassador chris stevens, sean smith, glen doherty and tyrone woods. i'm here to honor the service of those four men. the courage of the diplomatic security agency and the cia officers who risk their lives that night. and the work their colleagues do every single day all over the world. >> kate quigley is glen doherty's sister. she joins us with her impressions of the hearing.