G-Man was the leader of Combines. But Father Grigori aka Monk killed him. Now the Monk is the leader of Combines. Now the Monk wants to kill all the people.
This is the final release of the Kill the Monk. Before you install this mod, you will need to install Source SDK Base 2013 Single Player. After that, set it to Upcoming mode. And if you don't know how to do that, then follow this.