add a category in the sheriff eliminate the murderer section for known and unknown murderer.

so here is an example:

i kill the murderer after they stab 3 people with their sword out. that would go in the known murderer.

i kill the murderer randomly at the start of the game with no proof. that would go in the unknown.

Thats all!

The only thing is that If the murderer is holding his sword at the start of the game you technically could know who the murderer is.