Fatal Shot - Im Visier der Attentäter

Gavrilo Princip. Found in the collection of Museum of Yugoslavian History, Belgrad. (Photo by Fine Art Images/Heritage Images/Getty Images)

Mujahideen commander Ahmad Shah Massoud, Defense Minister of Afghanistan and leader of the Northern Alliance. | Location: Anaba, Panjshir Province, Afghanistan. (Photo by Jacques Langevin/Sygma/Sygma via Getty Images)

Rear view of American politician (and presidential hopeful), Senator Robert Kennedy (1925 - 1965) and wife Ethel stand at the the Ambassador Hotel podium and addresses his constituents and the press after his California primary election victory, Los Angeles, California, June 5, 1968. Shortly after leaving the podium, he was shot and died the following day. (Photo by Bill Eppridge /The LIFE Picture Collection via Getty Images)

(Original Caption) 4/10/81-Washington, DC: John Hinckley, Jr. (center), the man charged with the attempted murder of President Reagan, now finds himself the center of Federal protection, March 30th, as he is driven away from U.S. District Court. Hinckley was seated in the center seat of a nine-seat section station with agents assigned to protect him, seated in front, alongside, and behind him. Ph: John Full

A still image from CCTV footage recorded on February 27, 2018 shows former Russian spy Sergei Skripal buying groceries at the Bargain Stop convenience store in Salisbury on February 27, 2018. British detectives on March 8 scrambled to find the source of the nerve agent used in the "brazen and reckless" attempted murder of a Russian former double-agent and his daughter. Sergei Skripal, 66, who moved to Britain in a 2010 spy swap, is unconscious in a critical but stable condition in hospital along with his daughter Yulia after they collapsed on a bench outside a shopping centre on Sunday. / AFP PHOTO / - (Photo credit should read -/AFP via Getty Images)

4th June 1968: Two full-length police portraits of Jordanian assassin Sirhan Sirhan the night he assassinated Democratic presidential candidate Robert F. Kennedy, Los Angeles, California. (Photo by Hulton Archive/Getty Images)

RAWALPINDI, PAKISTAN - DECEMBER 27: (EDITORS NOTE: THIS IMAGE CONTAINS GRAPHIC CONTENT) A survivor stands amidst the carnage of dead and wounded following a bomb blast attack on former Prime Minister Benazir Bhutto December 27, 2007 in Rawalpindi, Pakistan. The opposition leader has died from wounds to the neck and head after speaking at an election rally in the northern city where an estimated 15 people were left dead by the explosion, party officials have been quoted as saying. (Photo by John Moore/Getty Images)

Mujahideen commander Ahmad Shah Massoud, Defense Minister of Afghanistan and leader of the Northern Alliance. | Location: Anaba, Panjshir Province, Afghanistan. (Photo by Jacques Langevin/Sygma/Corbis/Sygma via Getty Images)

This file picture taken on March 1, 1986 shows a pool of blood and flowers at Sveavagen in Stockholm where the assassination of Prime Minister Olof Palme took place. On February 28, 2016 is the 30th anniversary of his death. / AFP / TT News Agency / Bjorn Elgstrand/TT / Sweden OUT (Photo credit should read BJORN ELGSTRAND/TT/AFP via Getty Images)