"I am in debt to too many people," the note reads. "Too many people have suffered because of me. And I cannot imagine the suffering they will go through in the future."
Roh's death came amid an investigation into a bribery scandal that had tarnished his reputation.
Prosecutors were investigating the former president for allegedly receiving $6 million in bribes from a South Korean businessman while in office. Roh's wife was scheduled to be questioned by prosecutors Saturday, and Roh was planning to answer a second round of questions next week.