The Ultimate Guide To The Only Murders In The Building Season 5 Cast, Plot, And September 2025 Premiere

The Arconia is back in business, and the stakes have never been higher. As of today, December 15, 2025, the highly anticipated fifth season of Hulu’s hit mystery-comedy, Only Murders in the Building (OMITB), has officially premiered, plunging Charles, Oliver, and Mabel into their most personal and dangerous case yet. The new season, which began filming in March 2025 and wrapped in June 2025, promises a fresh, star-studded lineup of suspects and victims, all centered around a beloved, yet surprisingly complex, resident of the iconic Upper West Side building.

The core trio of true-crime podcasters is not just solving a murder; they are fighting to save their home, the Arconia, which faces an existential threat. This season, viewers are treated to an expanded look at the building's history, a new high-profile victim, and the introduction of several A-list guest stars who are sure to become immediate fan favorites—or immediate suspects. Prepare for a deep dive into everything you need to know about the current season, from the confirmed cast to the new, shocking murder mystery.

The Returning Core Cast and New High-Profile Additions for Season 5

The heart of Only Murders in the Building remains the unparalleled chemistry between its three lead stars. Fans will be delighted to know that the dynamic trio—the "Golden Trio" of the Arconia—are all back to investigate the latest homicide that has rocked the historic building. Their return was confirmed immediately following the Season 4 finale, with the new season premiering on September 9, 2025.

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The Main Trio: The Only Murders Podcast Team

• Steve Martin as Charles-Haden Savage: The semi-retired actor and resident of apartment 14C. Charles returns, still navigating his complicated love life and the lingering trauma from his past roles. His dry wit and dramatic flair will be essential for the new podcast episodes.
• Martin Short as Oliver Putnam: The perpetually optimistic, financially struggling Broadway director living in 10D. Oliver is back with a new theatrical project on the horizon, but his passion for the podcast and his need for a hit story will once again take center stage.
• Selena Gomez as Mabel Mora: The young, enigmatic artist and resident of 12A. Mabel Mora’s sharp instincts and ability to connect the dots are the driving force of the investigation. This season sees her grappling with a new, unexpected romantic interest while trying to keep her life on track.

The Confirmed Guest Stars and New Primary Entities

Every season of OMITB is defined by its incredible roster of guest stars, and Season 5 is no exception. This year, the series has secured some major names who are either new Arconia residents, potential suspects, or key figures in the new murder mystery. These additions promise to elevate the comedic and dramatic tension.

• Téa Leoni as Sofia Caccimelio: The most significant new character is Sofia Caccimelio, who was introduced in the final moments of the Season 4 finale. Leoni, known for her role in Madame Secretary, plays the wife of a missing mobster, Nicky "The Neck" Caccimelio. Sofia hires the trio to investigate her husband's disappearance, though her motives are immediately suspicious. There are also hints of a potential romantic spark between Sofia and Charles-Haden Savage, adding a layer of personal complication for the former TV star.
• Bobby Cannavale: The acclaimed actor has been seen filming scenes, suggesting he will play a major, recurring role in the new mystery. While his exact character details are under wraps, many speculate he could be a police detective, a rival podcaster, or even a mob associate connected to the Caccimelio case.
• Renee Zellweger: Another Oscar-winning star confirmed to be filming for Season 5. Her role is a closely guarded secret, but her involvement guarantees a high-caliber performance that will be central to the season’s narrative.
• Jermaine Fowler: Confirmed to have joined the cast, Fowler is expected to bring his comedic talents to a new Arconia resident or a figure connected to the victim, further expanding the list of suspects.

The New Murder Mystery: The Case of Lester Coluco

The fourth season ended with a shocking cliffhanger that set the stage for the Season 5 mystery. The victim this time is someone the Arconia residents—and the audience—know well: Lester Coluco, the building's long-serving doorman.

The Season 4 finale revealed the beloved doorman lying dead in the Arconia, making his murder the central focus of the new season’s investigation and the "Only Murders in the Building" podcast. The case is particularly compelling because Lester was a fixture of the building, a seemingly kind and quiet man who likely held secrets about nearly every resident and the Arconia itself. The murder of a doorman, whose job is to see and know everything, immediately creates a vast suspect pool, including many of the building’s eccentric residents.

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Plot Threads and Topical Authority Entities

The murder of Lester Coluco is not the only high-stakes plot line driving the narrative. Season 5 weaves together several compelling threads that build topical authority around the show's established lore and themes:

• The Arconia's Fate: Charles and Oliver find themselves accidentally involved in a fight to save the Arconia from being sold. This storyline adds a crucial emotional and structural element, as the building is as much a character as the trio themselves. If they fail, the podcast—and their friendship—could be over.
• The Caccimelio Connection: The parallel investigation into the disappearance of mobster Nicky Caccimelio, hired by his wife Sofia (Téa Leoni), provides a dark, comedic counterpoint to the doorman's murder. This thread introduces the world of organized crime into the cozy confines of the Upper West Side, potentially linking the two cases through the Arconia's complex history.
• Mabel's New Crew: Mabel Mora gathers a "ragtag group" to crash an exclusive ladies' night. This suggests a new dynamic for Mabel, potentially distancing her slightly from Charles and Oliver to pursue her own leads and develop her own investigative style, a key LSI keyword for her character arc.

Season 5: Release Date and What to Expect

The fifth season, consisting of ten episodes, officially premiered on September 9, 2025, continuing the show's tradition of a late-summer/early-fall release. The production schedule, which ran from March to June 2025, followed a similar trajectory to previous seasons, ensuring the high-quality, New York-centric production fans have come to expect.

What can viewers expect? More of the signature blend of sharp wit, genuine emotion, and intricate mystery. The murder of Lester Coluco is a deeply personal crime, and the investigation will force the trio to confront the secrets of their neighbors and the very foundation of the Arconia. The inclusion of major stars like Téa Leoni, Bobby Cannavale, and Renee Zellweger guarantees that the list of suspects is longer and more intriguing than ever before.

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The central theme of Season 5 appears to be the fight for home—not just solving the murder, but saving the physical and emotional space that brought Charles, Oliver, and Mabel together. As they dive into the doorman's past and navigate the dangerous world of the Caccimelio family, the trio will once again prove that sometimes, the most compelling stories are the ones happening right next door.