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).