Does the Miranda Rule apply to a purely private interrogation?

One of the statements was made to a private investigator employed by a hotel. Miranda does not apply to purely private interrogation. United States v. Birnstihl, 441 F.2d 368, 370 (9th Cir. 1971). The hotel investigator had been a deputy sheriff for 18 years. He had retired, however, and had no affiliation with any government law enforcement agency at the time he questioned appellant. There was no evidence that he acted as an agent of a law enforcement agency, see United States v. Birnstihl, supra, or that he questioned appellant at the suggestion or in aid of law enforcement officers, see Corngold v. United States, 367 F.2d 1, 4-5 (9th Cir. 1966).