We reported two weeks ago that Director Guy Ritchie (Sherlock Holmes, Excalibur) had cast Stephen Fry (Alice in Wonderland) opposite Robert Downey Jr. (Gravity, The Avengers) and Jude Law (Contagion) in the as yet Untitled Sherlock Holmes Sequel as Sherlock’s older, smarter brother, Mycroft.

Now, LatinoReview reports that Jared Harris (Mad Men, Fringe) has been cast in the role of the villainous Professor Moriarty in the as yet Untitled Sherlock Holmes Sequel

The as yet Untitled Sherlock Holmes Sequel is slated to hit theaters on December 16th, 2011.