Yoon is accused of leading an insurrection when he tried to impose martial law in 2024.
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A court in Seoul heard closing arguments in Yoon's trial, in which he was accused of being the "ringleader of an insurrection".
The charge stems from Yoon's attempt in December 2024 to impose military rule in South Korea - an act that lasted just hours but plunged the country into political turmoil. He was later impeached by parliament and detained to face trial.
Yoon has denied the charges against him, arguing that martial law was a symbolic gesture to draw public attention to the wrongdoings of the opposition party.
Leading an insurrection - the most serious charge against Yoon - carries the death penalty or life imprisonment and under South Korean law prosecutors must ask the judge for one or the other for the crime of insurrection.
South Korea has not executed anyone in nearly 30 years. In 1996, former military dictator Chun Doo-hwan was given the death penalty for seizing power in a military coup in 1979, though his sentence was later commuted to life imprisonment.
The prosecutors in Yoon's case argue that although no one was killed in his martial law attempt, Yoon's intent was no less violent.
They called to the stand the military commander who testified that Yoon had ordered the arrest of lawmakers.
They also presented as evidence the memo made by one of the planners of the martial law, a former military officer, containing the suggestion of "disposing" of hundreds of people including journalists, labour activists and lawmakers.
Yoon's insurrection trial has been merged with those of two other senior figures in his administration, former defence minister Kim Yong-hyun and former police chief Cho Ji-ho.
A verdict and sentencing for Yoon and the other defendants, if they are convicted, is expected at a later date - widely expected to be in February.
Yoon has been detai