Checking if a player has killed someone

How would you check if a player has killed someone?

Use **[Player.Frags

http://wiki.garrysmod.com/favicon.ico](http://wiki.garrysmod.com/?title=Player.Frags)**
or maybe use the killer variable in
**[Gamemode.PlayerDeath

http://wiki.garrysmod.com/favicon.ico](http://wiki.garrysmod.com/?title=Gamemode.PlayerDeath)**