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Kate Gordon Siegelbaum (born August 9, 1982), known professionally as Kate Siegel ( ), is an American actress and writer. Dubbed a scream queen for her extensive work in the Horror film, Siegel is known for her collaborations with her husband, Mike Flanagan. She has starred in the films Oculus (2013); Hush, which she co-wrote, and (both 2016); Gerald's Game (2017); The Life of Chuck (2024). On television, she has starred in the series The Haunting of Hill House (2018), The Haunting of Bly Manor (2020), Midnight Mass (2021), and The Fall of the House of Usher (2023).
In 2013, Siegel appeared in Man Camp. The same year, she appeared in Oculus, a horror film written and directed by Flanagan. The film had its world premiere at the Toronto International Film Festival in September 2013, and was released in April 2014. She also appeared in an episode of Mob City. In 2014, she appeared in Demon Legacy.
In November 2015, it was revealed that she and Flanagan would be adapting the young adult novel 13 Days to Midnight into a film.
In 2016, Siegel starred as a deaf-mute woman beset by a killer in the horror-thriller Hush, a film on which she also made her screenwriting debut, co-writing with Flanagan. The film had its world premiere at South by Southwest on March 12, 2016, and was released on Netflix on April 8, 2016. In July 2016, she starred in a commercial for Stelara psoriasis medication. That same year, Siegel appeared in , also directed by Flanagan, which was released on October 21, 2016.
In 2017, Siegel starred alongside Carla Gugino and Bruce Greenwood in the film adaptation of Stephen King's Gerald's Game, which was also directed by Flanagan. The film was released on September 29, 2017, by Netflix.
In 2018, Siegel had a starring role as Theodora Crain in the Netflix supernatural horror series The Haunting of Hill House, based on Shirley Jackson's 1959 novel of the same name. She also narrated the horror podcast Calling Darkness and has been a voice actor for The NoSleep Podcast.
Siegel portrayed Erin Greene in Netflix's Midnight Mass, which was written and directed by Flanagan, and co-starred her castmate from The Haunting of Hill House Henry Thomas.
In July 2024, she was confirmed to make her directorial debut, as she would direct a segment for V/H/S/Beyond, which was released exclusively on Shudder on October 4, 2024.
| 2009 | Ghost Whisperer | Cheryl | Episode: "This Joint's Haunted" | |
| 2010 | Numbers | Rachel Hollander | Episode: "And the Winner Is..." | |
| 2012 | Evey Kyler | Episode: "Prime Cut" | ||
| Castle | Nadia | Episode: "47 Seconds" | ||
| Where Would We Be | Stephanie | Episode: "Pilot" | ||
| 2013 | Mob City | Tandy | Episode: "Stay Down" | |
| 2018 | Theodora "Theo" Crain | Main role; 10 episodes | ||
| 2020 | Hawaii Five-0 | Leslie | Episode: "I ho'olulu, ho'ohulei 'ia e ka makani" | |
| Viola Willoughby / The Lady of the Lake | Guest star; 2 episodes | |||
| 2021 | Midnight Mass | Erin Greene | Main role; 7 episodes | |
| 2022 | Annette DeTamble | Recurring role; 3 episodes | ||
| 2023 | Camille L'Espanaye | Main role; 8 episodes | ||
| TBA | Carrie | TBA | In production |
| 2025 | Olivia Westbury |
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