SEOUL—South Korean prosecutors indicted former President Lee Myung-bak on graft charges, days after a fellow former president was sentenced to 24 years in prison in another case tying top political leaders to the rich conglomerates that dominate Asia’s fourth-largest economy.
Mr. Lee is accused of taking bribes totaling $5.85 million from Samsung Electronics Co. to pay legal fees incurred by DAS Corp., a car-parts manufacturer in which Mr. Lee’s brother owns a majority stake. Prosecutors on Monday accused Mr. Lee of embezzling...