The Wolfman
(2010)

After exacting revenge on his father Sir John (Anthony Hopkins), who is pretty evil and has been a wolfman for 25 years, (having killed Lawrence's mother when he was a boy, and his brother at the beginning of the movie) Lawrence (Benecio Del Toro) is killed in wolf form by the woman who loves him, Gwen (Emily Blunt).

Thanks LiliRoze!