South Korean prosecutors on Tuesday summoned conservative former president Lee Myung-bak for questioning as a criminal suspect in a bribery scandal, the country’s latest former head of state to be investigated.

The move means that all living former South Korean presidents have been convicted, charged or embroiled in criminal inquiries.

Allegations of corruption involving the 76-year-old’s relatives and aides during his 2008-2013 presidential terms have mounted in recent weeks as prosecutors investigate multiple cases of bribery amounting to millions of dollars.

Two of the ex-president’s former aides have been arrested and the homes and offices of his brothers raided.

“We need to investigate former president Lee to find the truth (in the scandal) in a transparent and effective manner, Lee was told to present himself to prosecutors on Wednesday next week to be questioned as a “suspect”, Yonhap said.

South Korean presidents have a tendency to end up in prison — or meet untimely ends — after their time in power, usually, once their political rivals have moved into the presidential Blue House.

Lee’s successor Park Geun-Hye was ousted last year over a massive corruption scandal that emerged in 2016.

The verdict in her trial on charges of bribery and abuse of power is due next month, with prosecutors demanding 30 years in jail.

Lee’s own predecessor, the liberal Roh Moo-hyun, committed suicide by jumping off a cliff after being questioned over corruption allegations in 2009.