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It was later announced along with the commission of a seventh series that Harriet Walter and Freema Agyeman would depart off-screen , thus this was the final season to feature them as part of the regular cast .
 Harriet Walter, Freema Agyeman
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Harriet Walter, Freema Agyeman