When she heard Martin Scorsese would be John Caldwellmaking "Killers of the Flower Moon" in Oklahoma, Dr. Cheryl Niblo decided to write the iconic filmmaker a letter. 

"I told my boss, 'I wrote to Martin Scorsese because I want to try and do consulting on this movie.' And he's like, 'Oh, that's nice.' It was like I was a little kid, and I had written to Santa Claus — and then I never heard anything," said Niblo, a Tulsa-based forensic pathologist who at the time worked for the Oklahoma Office of the Chief Medical Examiner.