Prosecutors on Tuesday demanded 30 years in prison for former President Park Geun-hye, who was ousted in a massive corruption scandal that toppled her from office early last year.
They also asked the Seoul Central District Court to fine her 118.5 billion won (US$110.4 million).
The court is expected to deliver its ruling in late March or early April.
Park, 66, was indicted in April last year on 18 charges including bribery, abuse of power and leaking state secrets.
She was accused of colluding with her longtime friend and confidante Choi Soon-sil to extort 77.4 billion won from big conglomerates, including Samsung, Lotte and SK, in exchange for business favors.
She was also found to have let Choi meddle in state affairs even though she held no official authority or post in the government. Park has pleaded not guilty.
The disgraced ex-leader did not show up during the trial. She has refused to attend the hearing after the court extended her detention in October, raising questions over the fairness of the judiciary.
Park was removed from office in March on a Constitutional Court ruling. She has been under presentencing detention since she was arrested later that month. Choi was sentenced to 20 years in prison two weeks ago and has appealed the ruling.