- Primary Subject: Cillian Murphy and Jack O'Connell playing brothers in A Quiet Place: Part III.
- Key Update: Jack O'Connell confirmed he will star alongside Cillian Murphy as surviving brothers in A Quiet Place: Part III, expanding Emmett's tragic backstory as the franchise concludes.
- Status: Confirmed
- Last Verified: October 21, 2026
- Quick Answer: Jack O'Connell confirmed he plays the brother of Cillian Murphy's character Emmett in A Quiet Place: Part III, expanding the family dynamic for the trilogy finale.
John Krasinski's post-apocalyptic saga is gearing up for its grand finale with A Quiet Place: Part III. Following the world-building expansion of prequel A Quiet Place: Day One, the franchise returns to complete the original story arc.
With Emily Blunt, Millicent Simmonds, and Noah Jupe returning, exciting new details have emerged as newcomer Jack O'Connell and Oscar-winner Cillian Murphy team up to set up a powerful brotherhood to seal the final chapter.
A Quiet Place: Part 3 Spotlights Cillian Murphy and Jack O'Connell as Surviving Brothers
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Considering that the A Quiet Place franchise continues to expand its universe through new characters outside of Krasinski and Blunt's survivor family, fans expected that Emmett (played by Cillian Murphy) would be the next to take the wheel in the threequel.
Jack O'Connell (Sinners, 28 Years Later) has officially revealed that he plays Emmett's estranged brother, a National Guardsman fighting to survive the alien apocalypse of sound-hunting monsters.
"A Quiet Place felt like family. It's about family, obviously. Got John Krasinski and Emily Blunt involved, and Cillian and I play brothers," O'Connell told Collider at the Newport Beach Film Festival. "There was a real familial feel to that one."
Placing two of Hollywood's most intense actors side-by-side as surviving brothers gives Part III a compelling emotional storyline to draw to an end to the franchise as their brotherhood promises to bring a fresh new perspective in a world where a single sound means death.
How the End of A Quiet Place: Part 2 Leads Into What Unravels in Part 3
After discovering that the sound-hunting creatures cannot swim, Regan Abbott (Millicent Simmonds) and Emmett (Cillian Murphy) located an isolated island community living in relative peace, establishing a potential sanctuary for human civilization.
Regan successfully used a radio tower to broadcast the feedback frequency from her hearing aid across the airwaves. By weaponizing the audio signal, she provided yet another surviving pocket of humanity, including Marcus and Evelyn Abbott elsewhere, with a much stronger defense against the monsters.
With the audio frequency not broadcasting across radio bands, surviving military remnants (including Jack O'Connell, who leads the National Guard faction) and scattered enclaves can finally fight back, as Part III sets up a unified final stand to reclaim the planet.
Meanwhile, A Quiet Place Part 3 hits cinemas on July 30, 2027. Stay tuned!
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