Lee's lawyers argued that she was insane at the time of the killing, which happened months after her husband died of cancer. Hakyung Lee, 44, was convicted of murder at Auckland High Court on Tuesday, after a trial that lasted about two weeks . A mother in New Zealand has been found guilty of killing her two children and hiding their bodies in suitcases, in a high-profile case that shocked the country. While she did kill her children, she was "not guilty of murder by reason of insanity," her lawyer said. But the prosecution argued that Lee had demonstrated rational thought by hiding the children's remains, changing her name and moving back to South Korea, the prosecution said.