Samsung Group leader Lee Jae-yong appeared at the South Korean special prosecutor's office on Monday for questioning as part of a wider investigation into an influence-peddling scandal that could topple President Park Geun-hye.
The special prosecution team would also question two other executives of Samsung, the country's largest conglomerate, on Monday, the spokesman said. The prosecutor's request to arrest Mr Lee was rejected by a court in Seoul on Jan 19.
Lee Jae-Yong, Samsung Electronics vice chairman and the son of the Samsung group boss Lee Kun-Hee, has been quizzed several times over his alleged role in the scandal that has rocked the nation.
A Seoul court rejected the arrest warrant on grounds of insufficient evidence.
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At the parliamentary hearing, Samsung admitted giving a total of 20.4bn won (£16m; $17.46m) to the two foundations, but denied seeking favours in return.
Lee also confirmed the company gave a horse and money to help the equestrian career of Choi's daughter but said he now regretted that. Along with Lee, Samsung Electronics president, Park Sang-jin, and Samsung's deputy director of corporate strategy, Chang Choong-ki, have been spotted arriving for additional questioning. The investigators also want to question Park in person, but have yet to agree with her office on how and when to do it. The secret confidante is on trial for charges including corruption and coercion.
Until then she remains formally president but stripped of her powers, which are handed to the prime minister, a presidential appointee.