Pick-up trucks are parked at the entrance of the home of George Knoop, 77, an American missionary, where he was killed this week, in Port-au-Prince, Haiti, Saturday, May 17, 2014. Police say George Knoop, who worked as a volunteer for U.S.-based Missionary Flights International. was fatally stabbed Tuesday afternoon in his home in the Delmas section of Haiti's capital. The 77-year-old missionary was apparently alone at the time and knew his assailant.( AP Photo/Dieu Nalio Chery)