An interrogator was one who questioned another about a crime.

In an alternate timeline experienced by Emperor Philippa Georgiou via the Guardian of Forever, Captain Michael Burnham defiantly refused to eat food after being arrested and imprisoned for her role in a conspiracy to overthrow the emperor. After refusing a meal, Burnham's interrogator, Captain Sylvia Tilly, responded that Doctor Hugh Culber would come at a later time to force-feed her. (DIS: "Terra Firma, Part 2")