So i had this Japanese friend who I'm suspicious about?

about 6 months ago I met this Japanese guy through a Korean online game and i got his email and we became good friends, we played the game together for long, but he's been absent since like 2 months ago and i don't know what happened to him.. he completely stopped logging in his email and in the game.. i don't like thinking about this but i do suspect that the guy died in an accident.. or what do you think happened to him ?