Cassidy's claim to fame was in her appearance in the film The Others and also starring as the lead in the television show Harper's Island.
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It was used as the set for the Irish television series Glenroe, which ran through the 1980s and 1990s.
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The beach in Kilcoole is the summertime home of the Little Tern, one of the few places in Ireland where these birds nest.
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Kilcoole was also the setting for the long-running hit TV show Glenroe, which was broadcast on RTÉ One.
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Athlete Fionnuala Britton who has represented Ireland internationally is a member of Kilcoole Athletic Club.