"Cold Blood": A Murder, a Book, a Legacy
http://digitalcommons.unl.edu/journalismstudent/26/
A fascinating project in which several journalism students revisited In Cold Blood and wrote articles exploring new angles, including the legacy of the book and the murders in Holcomb, Kansas.
George Plimpton on his life and Truman Capote's
https://www.youtube.com/watch?v=8WOK5_I1LwU
A YouTube video of George Plimpton speaking about himself and about Capote.
Crime Library
http://www.crimelibrary.com/index.html
An exhausting resource on details and evidence of various famous crimes, including the Clutter murders.