it like to agitate racial relations. reporter: seemingly consumed by a racist theory, roof told officials that he researched black-on-white crime during the george zimmerman trial, it was then he started down a path towards hate crimes. would you consider yourself a white supremacist? i do consider myself a white supremacist, sure. white people are superior. if that s what you mean. reporter: church surveillance video this week shows roof entering the house of worship in june of last year. he was inside for about 45 minutes, then roof peeks his head out, a glock .45 pistol in his hand. he then slowly walks out the door of the church. i was in absolute awe that nobody was out there after i shot that many folks. when i walked out that door, peeked out the door, i thought there was going to be somebody there to shoot me. reporter: roof was appeared to kill himself, but didn t when he saw no flashing lights, he told officials. in the video confession, roof laughs occasional