Questions on the player tags?

[icantevenname]

Y'know how the speech scripts have labels for characters like ATTACKER, MURDERER, REVIVER, right? What part of the game deals with that? If a player attacks or kills an player with the MURDERER tag, do they also get the tag? Would it be possible to have the game recognize if you attack a player with the MURDERER tag to trigger an effect? Like special speech lines or a bonus?