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 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 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 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 Dallas Times Herald staff photographer William Allen. This image shows Congressman Jim Wright, Senator Ralph Yarborough, and the Texas governor's wife, Nellie Connally, at the Fort Worth Chamber of Commerce breakfast at the Hotel Texas in Fort Worth on November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows unidentified employees of the Texas School Book Depository exiting the building after the assassination.

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 the south-facing exterior of the Texas School Book Depository as viewed from Elm Street. The southeast corner entrance to the building is visible, along with the first six floors of the building. The building's seventh and top-most floor does not appear in this picture. Open windows are visible on the fourth, fifth and sixth floors of the building.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows the exterior of the Texas School Book Depository the afternoon of November 22, 1963, after the assassination. A police officer and several police motorcycles are visible near the southeast corner of the building. A corner of the Hertz sign can be seen on the roof of the building. Several windows are open on the fifth and sixth floors of the building. An unidentified man in a shirt with rolled sleeves and a tie can be seen moving boxes in the southeast corner window on the sixth floor.