Original black and white photographic negative taken by Dallas Times Herald and United Press International photographer Darryl Heikes. This image, taken the evening of November 22, 1963, shows J.W. 'Will' Fritz, Captain of Homicide and Robbery for the Dallas Police, exiting his office at Dallas Police Headquarters as reporters crowd the hallway.

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 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. Taken from outside the building, this image is of the sixth floor southeast corner window of the Texas School Book Depository. Dallas Police Detective Robert L. Studebaker can be seen through the window, investigating the alleged sniper's perch on the afternoon November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. Taken from outside the building, this image is of the sixth floor southeast corner window of the Texas School Book Depository. Dallas Police Detective Robert L. Studebaker can be seen through the window, investigating the alleged sniper's perch on the afternoon November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. Taken from outside the building, this image is of the sixth floor southeast corner window of the Texas School Book Depository. Dallas Police Detective Robert L. Studebaker can be seen through the window, investigating the alleged sniper's perch on the afternoon November 22, 1963.

Original black and white photographic negative taken by an unidentified Dallas Times Herald staff photographer. The image shows Dallas Police Detective W.E. "Pete" Barnes with an ink print of Lee Harvey Oswald's right hand in the hallway at the Dallas Police Department headquarters on November 22, 1963.

Original black and white photographic negative taken by an unidentified Dallas Times Herald staff photographer. The image shows Dallas Police Detective W.E. "Pete" Barnes with an ink print of Lee Harvey Oswald's right hand in the hallway at the Dallas Police Department headquarters on November 22, 1963.

Original black and white photographic negative taken by an unidentified Dallas Times Herald staff photographer. The image shows an unidentified Dallas Police detective with the materials necessary to conduct a paraffin test at the Dallas Police Department on the evening of November 22, 1963. The test would help determine if suspect Lee Harvey Oswald had gunpowder residue on his person.

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 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 newspaper 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.

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.

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.

Original black and white photographic negative taken by a Dallas Times Herald staff photographer showing Dallas Police Officer H.B. McLain (at right, wearing white helmet) speaking with an unidentified man outside of Parkland Hospital on November 22, 1963. The man on the left is an unidentified Secret Service agent.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows an armed Dallas Police officer 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 - between 12:30 and 1 p.m. This image shows a Dallas Police officer standing in the street at the intersection of Houston and Elm streets outside the Texas School Book Depository. The Dal-Tex building is visible behind him; the Book Depository building is not visible.

Original 35mm black and white 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 a Dallas Police officer, holding a shotgun, standing in the street at the intersection of Houston and Elm streets outside the Texas School Book Depository. The Dal-Tex building and the County Records Building are visible behind him; the Book Depository building is not in the picture.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination. This image shows a Dallas Police officer holding a shotgun, standing amongst parked cars on the north side of 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 officer J.M. Valentine pointing to the location where the rifle was found on the sixth floor of the Texas School Book Depository on November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows Dallas Police officer J.M. Valentine pointing to the location where the rifle was found on the sixth floor 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 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.