The special counsel investigating the 2023 death of a Marine said Friday it has indicted former President Yoon Suk Yeol on charges of exerting undue pressure on the military's investigation into the case, with 11 other former senior security and defense officials also indicted.

Yoon has been questioned by the special counsel over suspicions that he ordered the presidential office and the defense ministry to reverse the initial findings of a military investigation into the death of Cpl. Chae Su-geun, in order to relieve a then Marine commander of responsibility.

The latest indictment is an addition to other indictments brought against the ousted former leader over his brief imposition of martial law on Dec. 3.

Yoon will stand trial on charges of abuse of power and tampering with official documents.

Related