Murder after online theft of weapon

What is it with these online disputes over something? There was a similar story about an online dispute last year.

Now again, a "Shanghai online game player murdered a competitor who he claimed sold his cyperweapon. Qiu Chengwei allegedly stabbed competitor Zhu Caoyuan repeatedly in the chest after he was told Zhu had sold his Dragon Sabre used in the popular online game, Legend of Mir III."

Online game companies in Shanghai are planning to set up a dispute system where aggrieved players can find recourse.

May be this is a solution, because the question is: How do you sue someone who is stealing something from you in an online game? This question should better be answered because of the growing popularity of online games, more is bound to happen.

(By Asia Business Consulting)