This photo taken on Tuesday, April 22, 2014, shows from left, slain American John Gabel, his mother, his father Gary Gabel sitting with Mohammad Hadi Hadayati, Kabul University's vice chancellor at Kabul University, in Kabul, Afghanistan. An Afghan police security guard opened fire on foreigners, on Thursday, April 24, 2014, as they entered the grounds of Cure International Hospital, killing three people, including pediatrician Dr. Jerry Umanos of Chicago. On Saturday, April 26, 2014, Kabul University vice chancellor Mohammad Hadi Hadayati identified the other two Americans killed in the attack as health clinic administrator John Gabel and his visiting father, Gary, also from the Chicago area. John Gabel’s wife, also an American, was wounded, Hadayati said. “We have lost a great man, a great teacher, a man who was here only to serve the Afghan people,” Hadayati said. John Gabel worked for the U.S.-based charity Morning Star Development and ran a health clinic at Kabul University, teaching computer science classes in his spare time, Hadayati said. John Gabel’s parents were visiting from Chicago, and Hadayati had lunch with the whole family the day before the attack. (AP Photo)