Who is the narrator in Edgar Allan Poe's story The Tell-Tale Heart?

The narrator in Edgar Allan Poe's "The Tell-Tale Heart" is an unnamed character who insists on their sanity while describing the meticulous planning and execution of a murder. Driven by an irrational obsession with the old man's vulture-like eye, the narrator's descent into madness becomes evident as they recount the events leading to the crime and their subsequent guilt. Their unreliable perspective creates a chilling atmosphere, emphasizing themes of guilt and paranoia.