A commenter below says that "There was no gambling problem, nor debt of any kind. The Korean media
hassled his friends, family and workmates for 'stories', and when they
got none, made up their own." There was a similar post at Dave's ESL Cafe... but I can't find the link.
On December 24, Yonhap (and 12 other news outlets) reported that on the evening of December 19 a 34 year-old Australian English teacher who worked part time at a university in downtown Seoul was found hanged in his office by his Canadian fiancee.
He’d apparently recently gone to a Casino in Seoul and racked up 8 million won in debt, and after a fight the night before with his fiancee, who he planned to marry in February, he killed himself.
This is the third death of a foreign teacher this year that I'm aware of, after a Korean Canadian teacher hanged himself in Busan in late March, and a teacher died of an apparent brain hemorrhage in Pohang in May.