'I did it' - Charleston church gun massacre jurors shown video of accused with police

Dylann Roof hesitated for about 20 seconds when an FBI agent asked him what he was doing on the night nine black church members were killed during Bible study, and then admitted: "I did it."

In a video recording of his interview, played in public for the first time today at his death-penalty trial, he was then pressed by the agents and asked exactly what he did.