Who is the missing Walker sibling? For a year, the answer was Rebecca, but DNA has proven that that's not William Walker's unaccounted for child. It's a character named Ryan Lafferty and today a newcomer named Luke Grimes has been cast in the role. When the storyline revealed that there was a Ryan somewhere out there, rumors were rife that a big name would land the role. Jason Ritter and Jason Dohring were in the running, but Grimes is set to sign on the dotted line and his resume is pretty slim, just a couple of minor movies, Assassination of a High School President and All the Boys Love Mandy Lane.
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