During a search of the sixth floor of the Texas School Book Depository, Dallas County deputy sheriff Luke Mooney discovers the sniper’s perch in the southeast corner and three empty rifle shells.

Image 1: R.W. “Rusty” Livingston Collection/The Sixth Floor Museum at Dealey Plaza

Image 2: William Allen, photographer. Dallas Times Herald Collection/The Sixth Floor Museum at Dealey Plaza

Video: WFAA-TV Collection/The Sixth Floor Museum at Dealey Plaza