PYONGYANG, North Korea - Even as the world changed around him, North Korean leader Kim Jong Il remained firmly in control, ruling absolutely at home and keeping the rest of the world on edge through a nuclear weapons program.
Inheriting power from his father in 1994, he led his nation through a devastating famine while frustrating the U.S. and other global powers with an on-again, off-again approach to talks on giving up nuclear arms in return for energy and other assistance. Kim was one of the last remnants of a Cold War-era that ended years earlier in most other countries.
His death was announced Monday by state television two days after he died. North Korea's news agency reported that he had died at 8:30 a.m. Saturday after having a heart attack on a train, adding that he had been treated for cardiac and cerebrovascular diseases for a long time. He was 69.
CBS News correspondent Celia Hatton reports news of Kim's death was met with a flood of televised emotion in North Korea, as state TV showed orderly columns of state officials weeping dramatically, and ordinary North Koreans beside themselves in apparent grief on the streets of Pyongyang.
In South Korea, however, like much of the rest of the world, the news provoked concern. Hatton reports that South Korea put its military on high alert Monday, even calling off-duty troops back to work in the event of any provocations from the North.
South Korea's Yonhap news agency reported later Monday that the North had. Two South Korean military officials said they couldn't immediately confirm the report, saying to do so would breach a policy of not commenting on intelligence matters.
Both said any firing would be part of a routine drill and have little relation to Kim's death. They both spoke on condition of anonymity, citing policy. Yonhap cited unidentified government and military officials as saying the test occurred off the east coast.
Kim, who reputedly had a taste for cigars, cognac and gourmet cuisine, is believed to have suffered a stroke in 2008 but he had appeared relatively vigorous in photos and video from recent trips to China and Russia and in numerous trips around the country documented by state media.
Kim Jong Il, who took power after the death of his father, unveiled his third son as his successor in September 2010, putting the twenty-something Kim Jong Un in high-ranking posts. On Monday, the North Korean news agencyas the country rallied around him.
Few firm facts are available when it comes to North Korea, and not much is clear about Kim Jong Il, the man known as the "Dear Leader."
North Korean legend has it that Kim was born on Mount Paektu, one of Korea's most cherished sites, in 1942, a birth heralded in the heavens by a pair of rainbows and a brilliant new star. Soviet records, however, indicate he was born in Siberia in 1941.
His father, Kim Il Sung, is the still-revered founder of North Korea. The elder Kim fought for independence from Korea's colonial ruler, Japan, from a base in Russia for years. He returned to Korea in 1945, emerging as a communist leader and becoming North Korea's first leader in 1948.
He meshed Stalinist ideology with a cult of personality that encompassed him and his son. Their portraits hang in every building in North Korea, and every dutiful North Korean wears a Kim Il Sung lapel pin.
Kim Jong Il, a graduate of Pyongyang's Kim Il Sung University, was 33 when his father anointed him his eventual successor.60 Minutes" got a glimpse of life in North Korea. Watch the report at left.)
Even before he took over, there were signs the younger Kim would maintain and perhaps exceed his father's hard-line stance.
South Korea has accused Kim of masterminding a 1983 bombing that killed 17 South Korean officials visiting Burma, now known as Myanmar. In 1987, the bombing of a Korean Air flight killed all 115 people on board; a North Korean agent who confessed to planting the device said Kim had ordered the downing of the plane.
When Kim came to power in 1994, he had been groomed for 20 years to become leader. He eventually took the posts of chairman of the National Defense Commission, commander of the Korean People's Army and head of the ruling Worker's Party. His father remained as North Korea's "eternal president."
He continued his father's policy of "military first," devoting much of the country's scarce resources to its troops even as his people suffered from a prolonged famine and built the world's fifth-largest military.
Kim also sought to build up the country's nuclear arms arsenal, leading to North Korea's first nuclear test, an underground blast conducted in October 2006. Another test came in 2009, prompting U.N. sanctions.
Alarmed, regional leaders negotiated a disarmament-for-aid pact that the North signed in 2007 and began implementing later that year. The process has since stalled, though diplomats are working to restart negotiations.
Following the famine, the number of North Koreans fleeing the country rose dramatically, with many telling tales of hunger, political persecution and rights abuses that North Korean officials emphatically denied.