In 2008 she was announced as the replacement for Geraldine McEwan as ITV's Miss Marple. She noted: "It’s difficult because Agatha Christie wrote her in two ways ... First, very much what Geraldine McEwan played: a slight, rather Victorian creature. Then, a little sturdier and tweedier. I chose the latter. A lot of people say they don’t like the tweedier version. But they’re both genuine." Also, she said: "Just about everybody in the world knows about Miss Marple and has an opinion of what she should be like, so I’m under no illusions about the size of the task ahead." McKenzie's first series of Marple comprised A Pocket Full of Rye, Murder is Easy, They Do It with Mirrors and Why Didn't They Ask Evans?. The second series of the show, which aired in 2010, included The Pale Horse, The Secret of Chimneys, The Blue Geranium, and The Mirror Crack'd from Side to Side. A sixth series, including adaptations of A Caribbean Mystery, Greenshaw's Folly and Endless Night, began filming in September 2012 and was broadcast in 2013.