Margaret Denise Quigley (born May 22, 1979), professionally known as Maggie Q, is an American actress and model. She achieved international notability starring in the title role of The CW's action-thriller series Nikita, airing from 2010 to 2013. She is also known for starring in the action films Mission: Impossible III and Live Free or Die Hard. In 2014, she portrayed Tori Wu in the film adaptation of Veronica Roth's novel Divergent, a role she reprised in its sequels. Q also starred in the Kevin Williamson-created CBS drama series Stalker as Lieutenant Beth Davis from 2014 to 2015.