Ousted South Korean president Park Geun-Hye reported to prosecutors Tuesday for questioning over the corruption and abuse of power scandal that brought her down, after using executive privilege to avoid them for months while in office.
Park apologised to the public as she arrived at the prosecutors’ office in Seoul, adding: “I will undergo the investigation sincerely.”
Ms Park resisted efforts to question her when she was president, but lost her immunity when judges upheld parliament's decision to impeach her.
She could be charged for allegedly allowing close friend Choi Soon-sil to extort money from large firms.
Ms Choi has been charged with bribery and corruption.
On Tuesday, Ms Park's supporters gathered outside her home in an affluent suburb of Seoul, as she was escorted by police to the prosecutors' office in a short journey covered live on television.
People waved the South Korean flag, a symbol of the pro-Park movement.
"I am sorry to the people. I will faithfully cooperate with questioning," Ms Park told the media when she arrived.
Ms Park is the first democratically elected leader to be ousted in South Korea.
Thousands of people celebrated in Seoul after her removal from office on 10 March.
However, angry protests by her supporters outside the Constitutional Court left two people dead.
The court ruling was the culmination of months of political turmoil and public protest.An election now will be held by 9 May.
Hwang Kyo-ahn, who is loyal to Ms Park, is now the acting president.
Park, 65, faces multiple charges from abuse of power and coercion to bribery, and is the fourth former South Korean leader to be probed or jailed over corruption scandals.
Two former army-backed leaders who served in the 1980s to 1990s — Chun Doo-Hwan and Roh Tae-Woo — served prison terms for bribery after they stepped down.
Roh Moo-Hyun, who served from 2003 to 2008, killed himself by jumping off a cliff after being probed by prosecutors over corruption allegations in 2009.