But the footage did not end with the killing, and it was what came after the killing that turned the video from a tragedy into a conspiracy.

Because Richard Cole did not flee.

He stayed.

And with a chilling, unhurried deliberateness, he set about the work of making his crime look like someone else’s.

The room watched him move through the office with the calm of a man following a plan he had made in advance, taking certain of the victim’s belongings, placing the missing cell phone into a small metal box, arranging the scene.

And then, from his coat, he produced a plastic bag, and from the bag he produced items that made Sarah Jenkins go white to the lips: a pair of work gloves and a light sweater, both of them Elena’s, both of them things she had left in Richard’s car in the ordinary course of family life two days before, never dreaming what they would be used for.