Last week on the season finale of 'White Collar,' former regular cast member Marsha Thomason made an appearance on the show as Agent Diana Lancing. That wasn't just a one-time return to the show, she's coming back full-time next season.
This is an interesting turn of events. Thomason was in the pilot but then vanished from the show and a new agent played by Natalie Morales joined the cast. But I don't know if Morales has ever fit in. They don't really give her much to do on the show. Not that they give the supporting agents a lot to do on the show anyway, but Morales especially has been underused.
'White Collar' creator Jeff Eastin confirms on Twitter that Morales will be leaving the show.