Murdered: Soul Suspect

The hero is a policeman, talented and devoted to duty. But there is a clarification - this is a dead policeman, killed because of his work, but he did not leave the world, he turned into a ghost and did not lose his passion for investigations. A hero can do many things in our world, but not all. Can be present everywhere and even pass through the walls (but not in closed houses, only through open doors and windows). Can see what ordinary people see, read, think.