Before their split: North Korean leader Kim Jong Un, right, and his uncle, Jang Song Thaek, in February 2012. Earlier this month, Jang was executed. Kyodo/Landov hide caption

itoggle caption Kyodo/Landov

Jang Song Thaek, who was North Korea's second-most powerful official, was put to death this week. Kyodo/Landov hide caption

itoggle caption Kyodo/Landov

A still image taken from North Korea's state-run television footage and released Monday shows Jang Song Thaek being forcibly removed by uniformed personnel from a meeting of the Central Committee of the Workers' Party of Korea in Pyongyang. Yonhap/Reuters/Landov hide caption

itoggle caption Yonhap/Reuters/Landov