Firstly, Jeffrey Donovan has joined the cast as Robert Kennedy. Donovan worked with Eastwood on Changeling and has also cropped up in Will Smith’s Hitch and TV series such as Burn Notice. We also hear that Miles Fisher has been cast as Agent Garrison.
Garrison interviews his boss, Hoover, at various stages during his life and given that Fisher is perhaps so far best known for this impersonation of Tom Cruise for Superhero Movie, this is somewhat of a step up for him. We’ll get to see him first in Final Destination 5, though that franchise entry is unlikely to shed much light on his potential in what will undoubtedly be a much more meaty dramatic role.
As we know, shooting on J. Edgar is already underway, so presumably the casting news will have to dry up before too long.
Sources: Variety and Deadline.