Lee died on 25 January 2026 at the age of 73 while attending a meeting of the
Peaceful Unification Advisory Council in Vietnam, becoming one of a few South Korean prime ministers to die abroad. He reportedly collapsed while waiting for his flight at
Tan Son Nhat International Airport in
Ho Chi Minh City on 23 January. Diagnosed with
myocardial infarction, Lee underwent stent insertion followed by
extracorporeal membrane oxygenation treatment but was unable to recover despite significant medical assistance after suffering two
cardiac arrests. Lee's body was repatriated aboard a Korean Air flight from
Tan Son Nhat International Airport, landing on the morning of 27 January at Incheon International Airport. Lee's body was welcomed at the airport by Prime Minister Kim Min-seok, National Assembly Speaker
Woo Won-shik, Democratic Party leader
Jung Chung-rae, floor leader
Han Byung-do, Interior and Safety Minister
Yoon Ho-jung, Unification Minister
Chung Dong-young, and
Cho Kuk, leader of the Rebuilding Korea Party. Escorted by military honor guard, Lee's wake was held at the memorial altar of
Seoul National University Hospital. President Lee Jae Myung posthumously awarded Lee Hae-chan the Mugunghwa Medal of the
Order of Civil Merit on 27 January 2026. The main funeral ceremony was then held at 9 a.m. at the National Assembly on 31 January, attended by President Lee with prime minister Kim Min-seok and National Assembly speaker Woo Won-shik giving the eulogy. Lee was cremated at 11 a.m. at Seoul Memorial Park in Seocho District, southern Seoul. Following the cremation, the procession stopped by the late former prime minister's home in Jeondong-myeon, Sejong. In accordance with his wishes to be laid to rest near his parents, Lee was buried at Eunhasu Park Cemetery in Sejong. ==National honours==