SEOUL, South Korea (AP) — Lee Kun-Hee, the ailing Samsung Electronics chairman who transformed the small television maker into a global giant of consumer electronics, has died. He was 78.

A Samsung statement said Lee died on Sunday with his family members, including his only son and de facto company chief Lee Jae-yong, by his side.

Samsung didn't announce the cause of his death, but Lee Kun-Hee had been hospitalized since May 2014 after suffering a heart attack and the younger Lee has run Samsung, the biggest company in South Korea.

“All of us at Samsung will cherish his memory and are grateful for the journey we shared with him,” the Samsung statement said. “Our deepest sympathies are with his family, relatives and those nearest. His legacy will be everlasting.”

Lee Kun-Hee inherited control from his father and during his nearly 30 years of leadership, Samsung Electronics Co. became a global brand and the world’s largest maker of smartphones, televisions and memory chips. Samsung sells Galaxy phones while also making the screens and microchips that power its rivals, Apple’s iPhones and Google Android phones.

Its businesses encompass shipbuilding, life insurance, construction, hotels, amusement park operation and more. Samsung Electronics alone accounts for 20% of the market capital on South Korea’s main stock market.

Lee leaves behind immense wealth, with Forbes estimating his fortune at $16 billion as of January 2017.

His death comes during a complex time for Samsung.

When he was hospitalized, Samsung’s once-lucrative mobile business faced threats from upstart makers in China and other emerging markets. Pressure was high to innovate its traditionally strong hardware business, to reform a stifling hierarchical culture and to improve its corporate governance and transparency.

Like other family-run conglomerates in South Korea, Samsung has been credited with helping propel the country’s economy to one of the world’s largest from the rubbles of the 1950-53 Korean War. But their opaque ownership structure and often-corrupt ties with bureaucrats and government officials have been viewed as a hotbed of corruption in South Korea.

Lee Kun-Hee was convicted in 2008 for illegal share dealings, tax evasion and bribery designed to pass his wealth and corporate control to his three children. In 1996, he was convicted for bribing a former president. But in both cases, he avoided jail after courts suspended his sentences, then a common practice that helped make business tycoons here immune from prison despite their bribery convictions.

Most recently, Samsung was ensnared in the explosive 2016-17 scandal that led to President Park Geun-hye’s ouster and imprisonment.

Lee Jae-yong was sentenced to five years in prison in 2017 for offering 8.6 billion won ($7 million) in bribes to Park and one of her confidants to help secure the government’s backing for his attempt to solidify control over Samsung. He was freed in early 2018 after an appellate court reduced his term and suspended the sentence. But last month, prosecutors indicted him again on similar charges, setting up yet another protracted legal battle.

Lee Kun-Hee was a stern, terse leader who focused on big-picture strategies, leaving details and daily management to executives.

His near-absolute authority allowed the company to make bold decisions in the fast-changing technology industry, such as shelling out billions to build new production lines for memory chips and display panels even as the 2008 global financial crisis unfolded. Those risky moves fueled Samsung’s rise.

Lee was born Jan. 9, 1942, in the southeastern city of Daegu during Japan’s colonial rule of the Korean Peninsula. His father Lee Byung-chull had founded an export business there in 1938 and following the 1950-53 Korean War, he rebuilt the company into an electronics and home appliance manufacturer and the country’s first major trading company.

When Lee Kun-Hee inherited control of Samsung from his father in 1987, Samsung was relying on Japanese technology to produce TVs and was making its first steps into exporting microwaves and refrigerators. The company was expanding its semiconductor factories after entering the business in 1974 by acquiring a near-bankrupt firm.

A decisive moment came in 1993. Lee Kun-Hee made sweeping changes to Samsung after a two-month trip abroad convinced him the company needed to improve the quality of its products.

In a speech to Samsung executives, he famously urged, “Let’s change everything except our wives and children.”

Not all his moves succeeded.

A notable failure was the group’s expansion into the auto industry in the 1990s, in part driven by Lee Kun-Hee’s passion for luxury cars. Samsung later sold near-bankrupt Samsung Motor to Renault. The company also was frequently criticized for disrespecting labor rights. Cancer cases among workers at its semiconductor factories were ignored for years.

Earlier this year, Lee Jae-yong declared heredity transfers at Samsung would end, promising the management rights he inherited wouldn’t pass to his children. He also said Samsung would stop suppressing employee attempts to organize unions, although labor activists questioned his sincerity.

The 52-year-old Lee expressed remorse for causing public concern over the 2016-17 scandal but did not admit to wrongdoing regarding his alleged involvement.

Lee Kun-Hee resigned as chairman of Samsung Electronics before the 2008 conviction. But he received a presidential pardon in 2009 and returned to Samsung’s management in 2010.

His family said a funeral will be private and hasn't released details.

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This story contains biographical material compiled by former AP business writer Youkyung Lee.