Yoo Dae-gyun was picked up from an office south of Seoul along with a woman accused of helping his fugitive life, Incheon Metropolitan Police Agency said.
Yoo is a major shareholder in Chonghaejin Marine Co, the operator of the ferry that sank in April. His father, Yoo Byung-eun, had founded the predecessor of Chonghaejin.
For months, authorities had sought the two saying embezzlement and other alleged corruption by the Yoo family may have contributed to the April 16 disaster that left 294 people dead and 10 still missing. Most of the victims were high school students.
DNA testing confirmed the body was that of the elder Yoo late Tuesday, and the National Forensic Service, South Korea's state-run forensic lab, said today that due to decomposition, it could not determine the cause of his death.
Authorities did not even suspect the body could be Yoo's until recently, even though his body was found near a villa police raided in May and items found near the remains could have offered clues about his identity. DNA tests took about 40 days and critics say officials could have done it sooner if they suspected it was him.
A high-level prosecutor resigned and two senior police officers were dismissed, but South Korean opposition lawmakers and media called for higher level officials to also step down.
The forensic service's chief Seo Joongseok and other experts told a televised news conference that they did not find any evidence showing that Yoo was poisoned, suffocated or died of external pressures or any disease. Police have said they haven't found any evidence Yoo was killed.
