Korean Man Arrested 16 Years After Killing His Girlfriend and Hiding the Body in Cement
|This is a pretty sick guy to not only kill his girlfriend, but continue to live in an apartment where he hid her body in cement on his balcony:

A 58-year-old man has been arrested for the murder of his girlfriend 16 years ago, after her remains were discovered during construction work.
Geoje Police and the Gyeongnam Provincial Police Agency said Monday they had arrested the man on suspicion of killing his live-in girlfriend in 2008. The man is accused of fatally striking the victim, who was in her 30s at the time, with a blunt object during an argument on Oct. 10 that year, at their residence in Geoje, South Gyeongsang Province.
The suspect then put the body inside a suitcase and hid it on the outdoor balcony next to the rooftop of the building. He then covered the luggage with bricks and poured cement over it to evade discovery.
The crime was uncovered 16 years later when the landlord of the building found the suitcase containing the body while conducting demolition work to prevent water leaks.
You can read more at the link.