Megan Boone was last seen as Elizabeth Keen in The Blacklist's season 8 finale, and since she was so prominent, many viewers wondered why she left before the final two chapters of the show. First appearing in The Blacklist's pilot, Boone's Elizabeth Keen was among the series' primary characters. Often referred to as Liz, Keen was portrayed as a talented FBI profiler whose storyline went through many significant changes as she started unraveling the mysteries of her past and its connections with criminal mastermind Raymond "Red" Reddington.