Hey, I found this on the Marvel Web site:
According to the The Hollywood Reporter, it is now safe to report (phew!) that James Cromwell (of Babe fame) has joined the already illustrious cast of Sam Raimi's Spider-Man 3. Cromwell will take on the role of Captain Stacy, father of the wall-crawler's love interest, Gwen Stacy, played by Bryce Dallas Howard.
As a loyal Marvelite you already know that in the books, Stacy, a former NYPD captain, who suspects the web-slinger's true identity, dies a heroic death while saving an innocent child, but Gwen-as would be our hero's luck-blames Spider-Man. Let's wait and see how this pans out in the film. For more info on Captain Stacy, check his profile in the Marvel Universe.
You can check out the info for yourselves by following this link:
http://www.marvel.com/company/showarticle.htm?id=1181.
Reported to SpiderFan by Bob Sodaro.