Han Jong-Hee, the co-chief executive of Samsung Electronics and a nearly four-decade veteran of the South Korean consumer technology giant, died on Tuesday. Mr. Han, who was 63, suffered a sudden heart attack, according to a company spokeswoman.

Samsung Electronics said on Tuesday that co-CEO Han Jong-hee had died of a heart attack, leaving newly-appointed boss Jun Young-hyun solely in charge of the tech giant as it revamps its underperforming chip business and navigates trade uncertainties.

Han Jong-Hee was one of Samsung’s co-chief executives and oversaw the consumer electronics and mobile devices businesses.