Lee Kun-hee, who built Samsung Electronics into a global powerhouse in smartphones, semiconductors and televisions, has died after spending more than six years in hospital following a heart attack, the company said.

The charismatic leader of Samsung Group and the country’s richest person grew it into South Korea’s biggest conglomerate. But he and the empire he built have also been vilified by critics for wielding huge economic clout, and for opaque governance and dubious transfers of the family wealth...