Consumer electronics and semiconductor giant Samsung will transition leadership after the death of its co-CEO Han Jong-hee, who died after being treated for a heart attack. A week before his death, Samsung appointed a new co-CEO,

Hee, who is credited for growing the Korean conglomerate into the world’s top electronics company, has died. He was 63.

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.