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Most prolific amateur sleuth

Most prolific amateur sleuth
Who
Jessica Fletcher
Where
United States
When
1984
Jessica Fletcher (played by British actress Angela Lansbury) the hero of Murder, She Wrote (CBS 1984-96) investigated crimes for 265 episodes and four-feature length movies. Agatha Christie’s Miss Marple has had fewer small-screen cases but in various incarnations has been on the air on-and-off since 1956, when played by Gracie Fields for the US one-off A Murder is Announced (NBC).