Role: Oracle
Attack: None
Defense: None
Unique: No
Examine one person each night. You will receive a revelation if that person has killed someone in the game.
If the person you check kills someone on the same night, you will learn that they did kill.
Roles such as the Godfather will be shown as "not killed" if they have a Mafioso who has visited. A Poisoner will not have killed if their poisoned victims have not died yet. These roles also do not work for those who have only attacked and maybe were not able to kill. A Witch or a non-Necronomicon CL will not be shown as killed anyone. Anyone who has killed will be shown as "killed" to the Oracle.
Sheriff: You cannot find any evidence of wrongdoing. Your target appears innocent.
Investigator: Investigator, Consigliere, Mayor, Tracker, Plaguebearer, or Oracle.
I know this role does not seem the most practical, but it can in use from time to time.