Original black and white photographic negative taken by an unidentified Dallas Times Herald staff photographer. This image shows Dallas Police officers in the Dallas Police Department headquarterson Monday, November 25, 1963, observing a moment of silence for slain Dallas Police officer J.D. Tippit. The man near the center of the image, wearing dark glasses, is Dallas Morning News reporter Tony Zoppi.

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 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 an unidentified Dallas Times Herald staff photographer. The image shows Dallas Police Public Information officer Glenn King(in the center, in uniform, wearing a tie) speaking with reporters in the third floor hallway of the Dallas Police Department headquarters on the evening of November 22, 1963. Nelson Benton, a CBS reporter, can be seen on the left. News cameras from ABC and KRLD-TV are visible in the foreground.

Original black and white photographic negative taken by an unidentified Dallas Times Herald staff photographer. The image shows Dallas Police Public Information officer Glenn King (in the center, in uniform, wearing a tie) speaking with reporters in the third floor hallway of the Dallas Police Department headquarters on the evening of November 22, 1963. Nelson Benton, a CBS reporter, can be seen on the left. News cameras from ABC and KRLD-TV are visible 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.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. The image shows Dallas Sheriff Bill Decker speaking to reporters while awaiting the arrival of suspect Lee Harvey Oswald outside the Sheriff's office on Sunday, November 24, 1963. Oswald was to be transferred from the city jail on the east side of downtown Dallas, to the county jail, which is located on the west side, bordering Dealey Plaza.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. The image shows Dallas Sheriff Bill Decker speaking to reporters while awaiting the arrival of suspect Lee Harvey Oswald outside the Sheriff's office on Sunday, November 24, 1963. Oswald was to be transferred from the city jail on the east side of downtown Dallas, to the county jail, which is located on the west side, bordering Dealey Plaza.

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.

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.