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Season Eleven of Murder She Wrote opens with an episode that would seem to have been inspired by the 1933 horror film Murders at the Zoo. Jessica Fletcher (Angela Lansbury) pays an extended visit to a California animal park, there to research her latest mystery novel. Inevitably, a real-life mystery begins to unfold when Mark Atwater (David Beecroft), fiancé of one of the park's workers, is killed by the venom of a deadly black mamba snake. It looks like an accident, but Jessica believes that the actual killer was of the two-legged rather than no-legged variety.