CORRECTS DATE TO DEC. 13 INSTEAD OF DEC. 6 - In this July 25, 2013 photo, North Korean leader Kim Jong Un, left, and then Vice Chairman of the National Defense Commission Jang Song Thaek walk through a cemetery for Korean War veteransin Pyongyang, North Korea marking the 60th anniversary of the signing of the armistice that ended hostilities on the Korean peninsula. North Korea on Friday, Dec. 13, 2013 announced the execution of Kim Jong Un's uncle, calling the leader's former mentor a traitor who tried to overthrow the state. The announcement came only days after Pyongyang announced through state media that Jang Song Thaek - long considered the country's No. 2 power - had been removed from all his posts because of allegations of corruption, drug use, gambling, womanizing and leading a "dissolute and depraved life." (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT

SEOUL, South Korea - Jang Song Thaek rose from a municipal bureaucrat to North Korea's No. 2 official — behind only leader Kim Jong Un.

But his ties were more than political: Jang was Kim's uncle, married to the leader's aunt, Kim Kyong Hui.

Jang's execution, announced early Friday, marked an unprecedented fall from grace of one of the most powerful figures in the country as well as its most serious political upheaval in decades.

The 67-year-old Jang held the posts of vice chairman of the National Defence Commission and member of the Political Bureau of the Central Committee of the Workers' Party.

In late 2008, Jang was assumed to be serving in a regency role while the young Kim Jong Un was being groomed to succeed his father, Kim Jong Il. Jang often accompanied Kim Jong Un on guidance trips and stood at his elbow at public events.

A well-travelled operator with a network that spread to China, Jang was considered the chief architect of economic policy that focused on partnering North Korea with its neighbour and ally.

Rumours of Jang's dismissal began surfacing in Seoul earlier this month. On Sunday, he was fired from all posts at a special party meeting and dragged away by soldiers. Four days after his dramatic public arrest, Jang was tried for treason by a special military tribunal and executed, state media reported.

The list of crimes against Jang was long, with plotting to overthrow the leadership the most serious of the allegations. Jang confessed, according to Pyongyang's official Korean Central News Agency.

For the outside world, KCNA's 2,700-word treatise ripping Jang's reputation to shreds provided an intriguing and revealing glimpse into the murky, feudalistic world of politics in the secretive country.

For North Koreans, the shocking public pillorying of a man seen as a father figure to Kim Jong Un was designed to send a clear message about the intolerance of opposition in a totalitarian state that demands absolute loyalty to the leader.

It was a humiliating end to a complicated career.

Jang, a native of the far northeastern border city of Chongjin, had humble roots but was sharp enough to gain entry to prestigious Kim Il Sung University in Pyongyang. He started as instructor for the Pyongyang City Committee of the Workers' Party, and he rose post by post until reaching the top ranks.

He was purged and sent to a labour camp for two years in the mid-2000s, according to Kim Young-soo, a North Korea expert at Sogang University in Seoul. That purge was widely seen as a move to clip his wings.

It was after Kim Jong Il's stroke in 2008, as the regime began preparing Kim Jong Un to succeed him, that Jang began his meteoric rise to the inner circle, an ascension that gained speed after Kim Jong Il's death from a heart attack in December 2011.

Jang was not a career military man but was made a four-star general, and often appeared at state events in a trim white general's uniform. He was appointed director of the Administration Department of the party's Central Committee, a position that gave him power over security agencies as well as the judiciary.

And as a core member of the Political Bureau, he helped engineer a campaign to bring the once-powerful military into the party's fold.

Jang played a key role in shaping economic policy in the impoverished country, particularly in expanding international joint ventures, particularly with China. Under Kim, the government has made improving the economy one of two main party objectives, along with building nuclear weapons.

Jang had recently added a new title: chairman of the State Physical Culture and Sports Guidance Commission, one of Kim Jong Un's pet projects. Until his dismissal Sunday, he last was seen publicly in early November meeting a sports delegation from Japan.

A shrewd-looking man who wore tinted glasses, Jang had basked in his special status as the second in power. He displayed boldness at public events where the rest of the top officials sat at attention, applauding with the kind of ennui only displayed by one other man: Kim Jong Un.

In its sharply worded character assassination, KCNA castigated Jang for "unwillingly standing up from his seat and half-heartedly clapping" when Kim received an important title.

State media portrayed Jang as a power-hungry and ambitious challenger to the throne who resorted to nepotism and favouritism to build his "little kingdom" as he plotted a coup against his nephew.

In North Korea, opposition to the supreme leader is treated as a criminal, counterrevolutionary act.

State media accused Jang of destroying the economy for his personal benefit, blaming him for masterminding the 2009 currency revaluation that resulted in rare protests in North Korea. He was held responsible for the shoddy quality of construction materials, charged with secretly trading in rare metals and was criticized for encouraging private enterprise.

He was described as a libertine and secret capitalist who distributed pornography and blew 4.6 million euros ($6.3 million) on gambling, according to state media.

Some of the accusations seem petty: reportedly rejecting factory workers' proposal to erect a mosaic of the two late leaders and putting a sculpture featuring Kim's signature in the shade, not in a central spot. No act of disloyalty small or large was overlooked.

Jang's conviction was preceded by the reported executions last month of his two closest confidants. KCNA confirmed one ally's purge Wednesday, calling Ri Ryong Ha a "flatterer" and stooge who with Jang was building an anti-Kim faction within the party.

The purge of Jang's accused comrades will continue, state media said.

What Jang's execution means for his wife was unclear. Kim Kyong Hui plays a key role in a leadership structure that stakes its claim to legitimacy on blood relations to her father, North Korea founder Kim Il Sung. Frail and said to be in bad health, Kim Kyong Hui has not been seen in video and photographs of this week's proceedings.

Jang and his wife, who met at university and married in 1972, have no surviving children, according to the South Korean government-run Information Center on North Korea. Their only child, a daughter, committed suicide in 2006 at age 29 while studying in Paris, according to South Korean media.

Jang's execution also calls into question the future of his relatives. A brother-in-law who is the ambassador to Cuba, and his nephew, the ambassador to Malaysia, reportedly were recalled to Pyongyang, according to South Korean officials.

Another relative, the deputy tourism minister, cancelled a trip to attend a tourism conference in Taiwan this week, Taiwanese officials told the island's state news agency, CNA.

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Associated Press writer Eun-Young Jeong contributed to this report. Follow Jean Lee at www.twitter.com/newsjean and www.instagram.com/newsjean.

News from © The Associated Press, 2013