Lee Jae-yong, vice chairman of South Korea's Samsung Electronics, and de facto leader of the sprawling Samsung Group, was convicted Tuesday of illegally using the anaesthetic drug propofol, the latest legal travail to beset the multibillionaire.

The world's 238th richest person, according to Forbes, Lee was fined 70 million won ($60,000) by the Seoul Central District Court, Yonhap news agency reported.