He'll play a deranged patient on the show. Big spoilers for the plot arc.
http://ausiellofiles.ew.com/2010/10/13/private-practice-confronts-rape/
While the role isn't pleasent at all, I'm actually glad it's dark. Nick does so well as an evil/jerk/dark character = see The Pack, The Wish and Entropy. Seems that so many fans forget that about him and only see him as lovable and funny. I hope he gets more dark and serious roles in the future.
http://ausiellofiles.ew.com/2010/10/13/private-practice-confronts-rape/
While the role isn't pleasent at all, I'm actually glad it's dark. Nick does so well as an evil/jerk/dark character = see The Pack, The Wish and Entropy. Seems that so many fans forget that about him and only see him as lovable and funny. I hope he gets more dark and serious roles in the future.