Murder, She Wrote, on CBS
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This ran for 12 seasons, from 1984-96, and was followed by four TV movies (1997, 2000, 2001, 2003). I probably saw most of the series, so it's definitely nostalgic to me. (I don't think I saw any of the movies, but I might have.) It starred Angela Lansbury as a murder mystery novelist named Jessica Fletcher, who lived in the (fictional) coastal town of Cabot Cove, Maine. And she ended up becoming an amateur sleuth, aiding the authorities in the investigations of murders (whether they wanted her to or not). I'm sure if I saw the show again, at least a couple characters besides Jessica would be familiar to me. But beyond the basic premise, and the character of Jessica herself, and the theme music, I don't remember any specifics about the show. Except that it always seemed ridiculous that there'd be so many murders in a small town like Cabot Cove. (Not every murder on the show happened there, but I feel like most of them did.) Anyway, I thought it was a fairly fun, or at least comfortable, show, while it lasted. (Though I dare say it lasted longer than it needed to.)