In this photo taken, Aug. 9, 2010, Cambodian survivors, Vann Nath, 66, from right, Bou Meng, 70, Chum Mey, 81, pose for a photograph at Tuol Sleng genocide museum, formerly Khmer Rouge's notorious S-21 prison in Phnom Penh, Cambodia. Nath lapsed into a coma in late August, 2011, after developing breathing difficulties, and his daughter Vann Chan Simen says he passed away on Monday, Sept. 5. (AP Photo/Heng Sinith)

Associated Press
In this photo taken, Aug. 9, 2010, Cambodian survivors, Vann Nath, 66, from right,  Bou Meng, 70, Chum Mey, 81, pose for a photograph at Tuol Sleng genocide museum, formerly Khmer Rouge's notorious S-21 prison in Phnom Penh, Cambodia. Nath lapsed into a coma in late August, 2011, after developing breathing difficulties, and his daughter Vann Chan Simen says he passed away on Monday, Sept. 5. (AP Photo/Heng Sinith)
In this photo taken, Aug. 9, 2010, Cambodian survivors, Vann Nath, 66, from right, Bou Meng, 70, Chum Mey, 81, pose for a photograph at Tuol Sleng genocide museum, formerly Khmer Rouge's notorious S-21 prison in Phnom Penh, Cambodia. Nath lapsed into a coma in late August, 2011, after developing breathing difficulties, and his daughter Vann Chan Simen says he passed away on Monday, Sept. 5. (AP Photo/Heng Sinith)
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