He had led the South Korean company’s smartphone and consumer-electronics division. Samsung’s other CEO, Jun Young-hyun, will lead the company as solo CEO.

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, who was in charge of Samsung's consumer electronics and mobile devices division, died while being treated for cardiac arrest on Tuesday.