This is Warren Commission Exhibit #482, which is one of two photos of the
Texas School Book Depository taken by Tom Dillard within a few seconds
of the last shot being fired at President Kennedy on November 22, 1963.
(This is Dillard's other TSBD picture.)

Just beneath Lee Harvey Oswald's sixth-floor sniper's window
can be seen Depository employees Bonnie Ray Williams (left)
and Harold Norman (right).

Norman later testified that he heard not only the three gunshots
being fired from directly over his head, but he also heard the three
empty cartridge casings hitting the plywood floor above him.

If Dillard had been just a little bit faster on his camera's shutter here,
he would have captured the only image of Oswald's rifle in the window.

This picture also shows one of Oswald's rifle-rest boxes,
positioned at an angle on the sixth-floor window ledge.

Below is another version of Dillard's zoomed-in photograph
of the Depository (click for a much larger view):