This undated image grab taken from footage shown by North Korea’s KCTV and released by South Korea’s Yonhap news agency on Monday shows Jang Song-thaek (center) reportedly being dragged from his chair during a meeting in Pyongyang. Photo: AFP/Yonhap

Jang Song-thaek, deposed senior official of North Korea, has been sentenced to death and executed after the Special Military Tribunal found him guilty of treason, the official news agency KCNA reported early Friday.

Jang, vice chairman of the National Defense Commission and secretary of the Workers' Party of Korea (WPK) administration department, was executed on Thursday immediately after the Special Military Tribunal convicted him of committing unforgivable crime as traitor, the report said.

The 67-year-old senior general, who was labeled as so-called reformer by outside forces, has been day-dreaming about being recognized as a "new regime," it said.

Jang, who was married to North Korean leader Kim Jong-un's biological aunt, committed such a "hideous crime as attempting to overthrow the state by all sorts of intrigues and despicable methods with a wild ambition to grab the supreme power of our party and state," the report said.

The Political Bureau of the Central Committee of the WPK stripped Jang of all posts and titles for "anti-party and counter- revolutionary crime" after an enlarged meeting on Sunday.

"Our party will never pardon anyone challenging its leadership and infringing upon the interests of the state and people in violation of the principle of the revolution, regardless of his or her position and merits," the WPK said in a resolution, calling on all party members and the Korean People's Army to be united under Kim's leadership for a "final victory."