Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image, taken from an upper level of the Dallas Trade Mart, shows banquet tables being set up on November 21, 1963, in preparation for the luncheon honoring President and Mrs. Kennedy scheduled for the following day.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image, taken from an upper level of the Dallas Trade Mart, shows banquet tables being set up on November 21, 1963, in preparation for the luncheon honoring President and Mrs. Kennedy scheduled for the following day.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image, taken from an upper level inside the Dallas Trade Mart, shows a fountain surrounded by tables on November 21, 1963.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image, taken from an upper level inside the Dallas Trade Mart, shows a fountain surrounded by tables on November 21, 1963.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image, taken on November 21, 1963, shows the presidential communications room that was set up for President Kennedy on the fourth floor of the Dallas Trade Mart.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image, taken on November 21, 1963, shows the presidential communications room that was set up for President Kennedy on the fourth floor of the Dallas Trade Mart.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer. This image, taken on November 21, 1963, shows the presidential communications room that was set up for President Kennedy on the fourth floor of the Dallas Trade Mart.

Original black and white photographic negative taken by Dallas Times Herald and United Press International photographer Darryl Heikes. This image shows assassination eyewitnesses Jean Hill (left) and Mary Moorman (right) at the Dallas County Sheriff's office the afternoon of November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald and United Press International photographer Darryl Heikes. This image shows assassination eyewitnesses Jean Hill (left) and Mary Moorman (right) at the Dallas County Sheriff's office the afternoon of November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald and United Press International photographer Darryl Heikes. This image shows assassination eyewitnesses Jean Hill (left) and Mary Moorman (right) at the Dallas County Sheriff's office the afternoon of November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald and United Press International photographer Darryl Heikes. This image shows assassination eyewitnesses Jean Hill (left) and Mary Moorman (right) at the Dallas County Sheriff's office the afternoon of November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald and United Press International photographer Darryl Heikes. This image shows assassination eyewitness Charles Brehm giving a telephone interview while at the Dallas County Sheriff's office the afternoon of November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald and United Press International photographer Darryl Heikes. This image shows assassination eyewitness Charles Brehm giving a telephone interview while at the Dallas County Sheriff's office the afternoon of November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald and United Press International photographer Darryl Heikes. This image shows assassination eyewitness Charles Brehm giving a telephone interview while at the Dallas County Sheriff's office the afternoon of November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald and United Press International photographer Darryl Heikes showing 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 Dallas Times Herald and United Press International photographer Darryl Heikes. This image shows a damaged stop sign on the southeast corner of Tenth Street and Patton Street in Oak Cliff, near the scene of Officer J.D. Tippit's murder on November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald and United Press International photographer Darryl Heikes. This image shows a damaged stop sign on the southeast corner of Tenth Street and Patton Street in Oak Cliff, near the scene of Officer J.D. Tippit's murder on November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows Dallas Police Detectives Leslie Montgomery and Marvin Johnson on the steps of the Texas School Book Depository with a long paper bag and Dr. Pepper bottle that were found on the building's sixth floor on November 22, 1963. Dallas Times Herald reporter Darwin Payne is located on the right in the image.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows Dallas Police Detectives Leslie Montgomery and Marvin Johnson on the steps of the Texas School Book Depository with a long paper bag and Dr. Pepper bottle that were found on the building's sixth floor on November 22, 1963. Dallas Times Herald reporter Darwin Payne is located on the right in the image.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows Dallas Police Detective Marvin Johnson on the steps of the Texas School Book Depository holding a Dr. Pepper bottle and a bag of chicken bones that were found on the building's sixth floor near the sniper's perch on November 22, 1963. Johnson appears to be talking with Dallas Times Herald reporter Darwin Payne.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This partial image shows Dallas Police Detective Marvin Johnson on the steps of the Texas School Book Depository holding a Dr. Pepper bottle, a bag containing chicken bones and a cigarette package that were found on the building's sixth floor near the sniper's perch on November 22, 1963. Johnson appears to be talking to Dallas Times Herald reporter Darwin Payne.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows Dallas Police Detective Marvin Johnson on the steps of the Texas School Book Depository holding a Dr. Pepper bottle, a bag containing chicken bones and a cigarette package that were found on the building's sixth floor near the sniper's perch on November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows Dallas Police Lieutenant J.C. "Carl" Day pointing to the area near the northwest corner of the Texas School Book Depository's sixth floor where Dallas Sheriff's deputies found the rifle used in the Kennedy assassination. The rifle had been hidden between some boxes. Lt. Day was head of the Dallas Police Crime Scene Search Unit responsible for the forensic investigation of physical evidence.