Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows two Dallas Police officers (Left: Inspector J. Herbert Sawyer. Right: Marvin Wise.) guarding the entrance to the Texas School Book Depository on November 22, 1963 after the assassination. The officer on the right holds a shotgun in his left hand.

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 outside the entrance to the Texas School Book Depository.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows Dallas Police officers on the northeast corner of the Texas School Book Depository on November 22, 1963. Police officers have used rope and vehicles to separate the crowd from the building.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows Dallas Police officers on the northeast corner of the Texas School Book Depository on November 22, 1963.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows President and Mrs. Kennedy descending from Air Force One at Love Field on the morning of November 22, 1963.

Original black and white photographic negative taken by s Dallas Times Herald staff photographer. This image shows President Kennedy shaking hands with members of the crowd along the fence line at Love Field on the morning of November 22, 1963.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows President Kennedy at Love Field in front of Air Force One on the morning of November 22, 1963. The man on the left side of the image is Secret Service agent Paul Landis.

Original black and white photographic negative by a Dallas Times Herald staff photographer. This image shows President Kennedy and the crowd at the fence at Love Field and a well-wisher's sign: "We Welcome You With Vigah J.F.K." (spelling the word vigor as "vigah" to reflect Kennedy's Boston accent).

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows President Kennedy greeting the crowd at Love Field on the morning of November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald and United Press International newspaper photographer Darryl Heikes. This image shows the presidential limousine completing the turn onto Main Street from Harwood Street in downtown Dallas. The motorcycle officer in the foreground is Billy Joe Martin.

Original black and white photographic negative taken by Dallas Times Herald and United Press International newspaper photographer Darryl Heikes showing the presidential motorcade turning from Harwood Street onto Main Street in downtown Dallas. Secret Service Agent Clint Hill, assigned to Jacqueline Kennedy, occasionally rode on the rear bumper of the president's car, as seen in this image, when the crowds grew heavy.

Original black and white photographic negative taken by Dallas Times Herald staff photographer Eamon Kennedy. This image shows an unidentified Catholic priest in the parking lot of Parkland Hospital on November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows the recreation of the sniper's perch by the Dallas Police on the sixth floor of the Texas School Book Depository on November 22, 1963. Police moved the boxes during their search for evidence; this recreation shows the boxes after the police had put them back in what they thought were their original positions.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows the recreation of the sniper's perch by the Dallas Police on the sixth floor of the Texas School Book Depository on November 22, 1963. Police moved the boxes during their search for evidence; this recreation shows the boxes after the police had put them back in what they thought were their original positions.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows a group of reporters and photographers gathered at a nurses station at Parkland Hospital after the arrival of Lee Harvey Oswald on November 24, 1963. A small group of police officers is also visible in this image. A sign on the door in the background says "Blood saves lives."

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image shows Dallas County Criminal District Attorney Henry Wade and Captain of Homicide and Robbery J.W. 'Will' Fritz (wearing a hat and glasses) surrounded by reporters in the hallway outside the Homicide and Robbery Bureau at the Dallas Police Department headquarters.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer, possibly Eamon Kennedy. This image shows Lee Harvey Oswald's brother Robert Oswald (in the right forefront) and Marina Oswald (holding her daughter June) as they leave Parkland Hospital on Sunday, November 24, 1963, after the death of suspected assassin Lee Harvey Oswald.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer, possibly Eamon Kennedy. This image shows Lee Harvey Oswald's brother, Robert Oswald (in the grey suit), and a security escort (possibly Secret Service) leaving Parkland Hospital on Sunday, November 24, 1963, after the death of suspected assassin Lee Harvey Oswald.

Original black and white photographic negative taken by Dallas Times Herald and United Press International photographer Darryl Heikes. This image shows Dallas Police Sergeant Roy Shipley guarding the site at 404 E. Tenth Street where Officer J.D. Tippit was shot and killed in Oak Cliff, about 45 minutes after the assassination of President Kennedy. The dark spot on the street near Shipley's foot is stained with Tippit's blood.

Original black and white photographic negative taken by Dallas Times Herald and United Press International photographer Darryl Heikes showing the site at 404 E. Tenth Street where Officer J.D. Tippit was shot and killed in Oak Cliff, about 45 minutes after the assassination of President Kennedy. Witnesses and investigators stand near a parked car. A crime scene investigator's kit is visible in the lower right corner of the image.

Original black and white photographic negative taken by unidentified Dallas Times Herald staff photographer. This image shows Dallas Police Chief Jesse Curry watching as Secret Service agents carry clothes and hats to a waiting car outside of Parkland Hospital on November 22, 1963. A crowd waits for news. The rounded windshield of a police motorcycle is visible in the foreground.

Original black and white photographic negative taken by an unidentified Dallas Times Herald staff photographer. Taken on the afternoon of November 27, 1963, this image shows the first Secret Service reenactment of the assassination of President Kennedy. A light colored convertible, intended to represent the presidential limousine, is passing the Texas School Book Depository as it travels down Elm Street, escorted by police motorcycles. Onlookers line both sides of Elm Street to watch the reenactment; memorial flower arrangements are visible on the grass on both sides of the street.

Original black and white photographic negative taken by an unidentified Dallas Times Herald staff photographer. Taken on the afternoon of November 27, 1963, this image shows the first Secret Service reenactment of the assassination of President Kennedy. A light colored convertible, intended to represent the presidential limousine, is passing the Texas School Book Depository as it travels down Elm Street, escorted by police motorcycles. Onlookers line both sides of Elm Street to watch the reenactment; memorial flower arrangements are visible on the grass on both sides of the street.

Original black and white photographic negative taken by an unidentified Dallas Times Herald staff photographer. This image shows the first Secret Service reenactment of the assassination of President Kennedy on the afternoon of November 27, 1963. A light-colored convertible representing the presidential limousine approaches the triple underpass as it travels down Elm Street, accompanied by police motorcycles.