Luddington, who has also appeared as an intern for the past two seasons of "Grey's Anatomy," received a message on her Twitter account last month saying if she didn't pull out of the latest video game production, she would die, TMZ reported.
Among the threats she received were:
-- "[You] have 24 hours to leave the film TR, if not, we will go and kill, we are observing!!!!!"
-- "It's time, today at 2:15 PM, we will kill!!!"
-- "You will die Camilla!!!"
Authorities obtained a search warrant for the people who control the Twitter accounts that sent the threatening messages.
Celebrity Families of 2014 [PHOTOS]