Murder mystery map help

i need help with making it so that there is 1 murderer, 1 sheriff, and that everyone else is innocent
i also need help with the tagging for killing as the murderer

Make sure that the murderer is on a different team than the innocents. Then have a tagging device that sets the tagging team to team 2 and the other team to team 1.
Then, you can select the murder like so: