Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) The bodies of two UN experts who went missing in the Democratic Republic of Congo this month have been found, the United Nations said in a statement Tuesday. UN Secretary-General Antonio Guterres said UN peacekeepers discovered the bodies of US citizen Michael Sharp and Swedish national Zaida Catalan on Monday outside the city of Kananga. The body of their Congolese interpreter, Betu Tshintela, was also discovered with them. A Congo government official told CNN that Catalan's body was found decapitated, but Sharp and Tshintela were not beheaded. Their cause of death is not determined, according to government spokesman Lambert Mende.Bodies of UN experts who went missing two weeks ago discoveredUN chief urges DRC government to conduct full investigation 
 Question:_'s father, John Sharp, expressed his sorrow Tuesday on Facebook.

Michael Sharp