|1 person marked this as a favorite.|
I don't want to detract from the other great advice on this thread, but I would like to offer another suggestion.
Pay attention to the time being given to that player. If the player is being disruptive, this is often because he is getting an uneven amount of play time to follow his misadventures. Just divide up the actual play time according to the people at the table. For example, imagine four players and one spends five minutes of actual time trying to rob some random store, then after that time you make sure each other person at the table also gets five minutes of time. If those players are together, that time is added consecutively. Therefore, the lone player gets five minutes of play time while the other three all share fifteen. The lone player is "busy" with his robbery while the others are playing. Eventually, he'll get the point that playing with the group gets him more fun time.
Granted, this only works if this player is actually leaving the others to start his own trouble. That is an assumption I'm making from the way you described his behavior.