Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows a Dallas police officer speaking into the radio on his motorcycle outside of Parkland Hospital on November 22, 1963. A crowd of people waits behind the line created by the parked motorcycles.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows Captain J.W. "Will" Fritz and Elmer Boyd, both of the Dallas Police Department, exiting the Texas School Book Depository on November 22, 1963. Elmer Boyd carries a rifle in his right hand.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows Dallas Police officers in the intersection of Elm and Houston streets following the assassination on November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination. This image shows Dallas Police officers in the intersection of Houston and Elm streets. The Dal-Tex Building at 501 Elm Street is in the background.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination. This image shows several Dallas Police officers holding shotguns, standing in the intersection of Houston and Elm streets near the Texas School Book Depository. The Dal-Tex Building at 501 Elm Street is visible in the background.

Original black and white photographic negative taken by Dallas Times Herald photographer William Allen. This image shows Dallas Police officers, investigators and reporters gathering outside the front entrance to the Texas School Book Depository shortly after the assassination as they waited to learn if any suspects were found inside the building.

Original black and white photographic negative taken by Dallas Times Herald photographer William Allen as police and detectives guard the front entrance to the Texas School Book Depository building within 50 minutes of the assassination. Shortly after this picture was taken, Dallas Police officer M. N. McDonald, right, raced to Oak Cliff to investigate when he heard on the police radio that an officer had been shot there.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination - between 12:30 and 1 p.m. This image shows Dallas Police officers at the southeast corner entrance to the Texas School Book Depository.

Original black and white photographic negative taken by an unidentified Dallas Times Herald photographer. This image shows Dallas police officer Kenneth Heard and other unidentified Dallas police officers standing guard outside the Dallas Trade Mart where President Kennedy was to speak at a luncheon. The Trade Mart is part of the Market Hall complex just north of downtown Dallas.

Original black and white photographic negative taken by a Dallas Times Herald photographer. This image shows Dallas police officer Kenneth Heard and other unidentified Dallas police officers standing guard outside the Dallas Trade Mart where President Kennedy was to speak at a luncheon. The Trade Mart is part of the Market Hall complex just north of downtown Dallas.

Original black and white photographic negative taken by an unidentified Dallas Times Herald photographer. This image shows a Dallas police officer and other unidentified Dallas police officers standing guard outside the Dallas Trade Mart where President Kennedy was to speak at a luncheon. The Trade Mart is part of the Market Hall complex just north of downtown Dallas.

Original black and white photographic negative taken by Dallas Times Herald and United Press International staff photographer Darryl Heikes. The image shows Dallas Police Sergeant Gerald 'Jerry' Hill being interviewed in the third floor hallway of Dallas Police headquarters in the evening of November 22, 1963. Bill Mercer, a KRLD reporter, can be seen at left in the image, holding a microphone and standing to Hill's right; Mercer is partially obscured by a television camera in the foreground.

Original black and white photographic negative taken by Dallas Times Herald and United Press International staff photographer Darryl Heikes. The image shows Dallas Police Sergeant Gerald 'Jerry' Hill being interviewed in the third floor hallway of Dallas Police headquarters in the evening of November 22, 1963. Bill Mercer, a KRLD reporter, can be seen at left in the image, holding a microphone and standing to Hill's right; Mercer is partially obscured by a television camera in the foreground.

Original black and white photographic negative taken by Dallas Times Herald and United Press International staff photographer Darryl Heikes. The image shows Dallas Police Sergeant Gerald 'Jerry' Hill being interviewed in the third floor hallway of Dallas Police headquarters in the evening of November 22, 1963. Bill Mercer, a KRLD reporter, can be seen at left in the image, holding a microphone and standing to Hill's right; Mercer is partially obscured by a television camera in the foreground.

Original black and white photographic negative taken by Dallas Times Herald and United Press International staff photographer Darryl Heikes. The image shows Dallas Police Sergeant Gerald 'Jerry' Hill being interviewed in the third floor hallway of Dallas Police headquarters in the evening of November 22, 1963. Bill Mercer, a KRLD reporter, can be seen at left in the image, holding a microphone and standing to Hill's right; Mercer is partially obscured by a television camera in the foreground. An effect that appears like fine white confetti scattered on the lighter areas of the image is inherent to the original negative.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination. This image shows Dallas Police Sergeant Gerald Hill leaning out of a sixth floor window adjacent to the alleged sniper's perch at the Texas School Book Depository.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows the Dallas skyline on the night of November 22, 1963, after the assassination of President Kennedy. The photographer was standing on a slight elevation west of downtown.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows the Dallas skyline on the night of November 22, 1963, after the assassination of President Kennedy. The photographer was standing on a slight elevation west of downtown.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows the Dallas skyline on the night of November 22, 1963, after the assassination of President Kennedy. The photographer was standing on a slight elevation west of downtown.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows the Dallas skyline on the night of November 22, 1963, after the assassination of President Kennedy. The photographer was standing on a slight elevation west of downtown.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows the Dallas skyline on the night of November 22, 1963, after the assassination of President Kennedy. The photographer was standing on a slight elevation west of downtown.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows the Dallas skyline on the night of November 22, 1963, after the assassination of President Kennedy. The photographer was standing on a slight elevation west of downtown.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows the Dallas skyline on the night of November 22, 1963, after the assassination of President Kennedy. The photographer was standing on a slight elevation west of downtown.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows the Dallas skyline on the night of November 22, 1963, after the assassination of President Kennedy. The photographer was standing on a slight elevation west of downtown.