2.4 Player Versus Player
If two individuals are fighting and you have no proof of which could be the traitor, you must wait before joining in the fight until one player dies and they either; identifies the body/round ends/question them.
Basically, the staff member handled the situation wrongly. If you did not walk away from the body then either the detective should have waited for you to ID it or he should have questioned you. The detective broke a rule and the staff member handled the situation incorrectly.