Jeon Joo-hwan, the 31-year-old suspect in the murder of a subway worker, appears before reporters at a Seoul police station, Sept. 21. Yonhap

A stalking suspect now under arrest for the recent murder of a Seoul subway worker was sentenced by a court Thursday to an imprisonment of nine years on charges of stalking and illegally filming his victim.

The Seoul Western District Court also ordered Jeon Joo-hwan, 31, to undergo 80 hours of stalking treatment and 40 hours of sexual offense treatment, in addition to the prison sentence.

Jeon, a former Seoul Metro worker, was arrested for allegedly stabbing his former female colleague in her 20s to death at Sindang Station in central Seoul on Sept. 14. The murder took place one day before the Seoul court was to sentence Jeon on charges of stalking her.