The Osage killings: The American mass murder story you've never heard before

It’s a mass murder story largely forgotten in American history and one that took place less than 100 years ago. In his latest nonfiction book, “Killers of the Flower Moon,” New Yorker writer and bestselling author David Grann investigates the mysterious murders of members of the Osage Indian tribe of Oklahoma in the 1920s. Grann sat down with Yahoo Global News Anchor Katie Couric to talk about his new book, the mystery behind the murders and the A-listers rumored to be attached to the movie adaptation.