Via a reader tip comes this interesting CBS News report about an English teacher murdered in Seoul back in 1988 and how her alleged killer is free back in the US:

Imagine a loved one brutally murdered in a foreign country — allegedly by another American.
Correspondent Peter Van Sant and his team have investigated the disturbing 1988 murder of Carolyn Abel, an American teacher in South Korea, and the loophole in U.S. laws at the time that mean the suspected killer may never face trial.For writer and author Nancy Bercaw, flying to South Korea last winter reopened a painful chapter in her life: one of murder, loss and fear.
CBS News
You can read the whole thing at the link, but the suspected killer of Carolyn Abel was her boss at the English school she worked at named Kathy Patrick. Patrick was gay and supposedly was angered when Abel rejected her advances and decided to kill her. After killing her Patrick then flew home to Washington State. Since there was no extradition treaty between the US and Korea at the time, US authorities could not arrest her for murder.
Since the murder Patrick has lived as a free woman in Washington state and she actually currently works at Western Washington University advising students.