Only Murders in the Building Season 3: Killer, Cast, Episodes

Only Murders in the Building season 3 drops 10 episodes on Hulu starting August 8, 2023, centering on the murder of a Broadway star on opening night. If you’ve been putting off the season or want to refresh your memory before diving back into the Arconia’s latest scandal, here’s everything you need to know.

Premiere Date: August 8, 2023 · Platform: Hulu · Episodes: 10 · Main Stars: Selena Gomez, Steve Martin, Martin Short · Guest Stars: Meryl Streep, Paul Rudd

The table below consolidates the core details verified across multiple sources.

Who’s the killer in Only Murders in the Building season 3?

Season 3 introduces a murder tied directly to the theater world Oliver Putnam has poured his energy into. Ben Glenroy, the Hollywood star brought in to headline Oliver’s Broadway production, dies on the opening night of the play — collapsing on stage in front of the Arconia’s assembled audience. The investigation that follows narrows in on someone among the production’s cast and crew.

Killer identity

Rolling Stone praised the season’s commitment to fair-play mystery structure, noting that Meryl Streep’s comedic timing elevates every scene she appears in.

• The killer is ultimately revealed to be someone involved in the theater production itself, with motive rooted in the complex web of relationships and secrets surrounding the play (Den of Geek recap)

Season 3 ending explained

The finale resolves the murder mystery with the trio having gathered enough evidence to expose the killer. The resolution ties together threads woven throughout the season, including backstage tensions, personal rivalries, and the high stakes of a Broadway debut gone catastrophically wrong.

What happened in season three of Only Murders in the Building?

Season 3 picks up months after the events of season 2, with Charles, Oliver, and Mabel still living in the Arconia but finding new reasons to investigate. The trio’s latest true-crime podcast obsession turns personal when Ben Glenroy — the big-name actor Oliver has recruited for his Broadway play — dies during opening night, and the circumstances are unmistakably murder.

“There will be ten episodes total in Only Murders in the Building season three, and new episodes will stream weekly on Tuesdays on Hulu.” — Town & Country

Podcast production arc

• Oliver’s play becomes the central focus of the season, with the investigation intersecting with the day-to-day chaos of live theater production (Town & Country episode guide)
• The podcast trio applies their signature investigative approach to backstage drama, combing through cast secrets and production tensions
• Meryl Streep appears as Loretta, an actress with her own ambitions and obstacles within the play

Arconia developments

The Arconia remains central to the show’s geography, but the season expands outward to include theater spaces, rehearsal rooms, and the broader entertainment industry ecosystem. Charles faces new challenges in his personal life, Oliver deals with the consequences of his financial gambles, and Mabel navigates relationships both old and new.

Who does Mabel date in Only Murders in the Building season 3?

Mabel’s romantic subplot unfolds across the season, with her dating life intersecting with the broader mystery. The episode titled “Ah, Love!” specifically focuses on Mabel’s romantic storyline, presenting a contrast to her investigative focus.

Mabel’s romance in “Ah, Love!”

• Episode 10 centers on Mabel’s relationship, exploring how her personal connections develop alongside the season’s murder investigation
• The dating storyline is woven into the larger tapestry of Arconia relationships and the ongoing mystery

What this means: Mabel’s romantic arc serves as an emotional counterweight to the season’s darker elements, offering moments of levity and vulnerability that deepen her character beyond the investigative role she typically occupies.

What was Poppy’s motive for killing Bunny?

This question reflects viewer curiosity that carries over from earlier plotlines — the resolution of Bunny Folger’s murder from season 2 remains relevant to the show’s ongoing mythology. While the focus of season 3 shifts to Ben Glenroy’s death, the lingering questions about season 2’s perpetrator and motive persist among dedicated viewers.

Poppy’s backstory

• Poppy, revealed in earlier seasons as the true perpetrator behind Bunny’s murder, operated with a motive tied to the secret history of the Arconia and its residents
• The character’s connection to Becky Butler and the broader conspiracy of the building’s hidden past drives the revelation

Connection to villains

The Poppy storyline connects season 2’s murder resolution to the layered web of secrets that continue to influence events in season 3, demonstrating how past crimes cast long shadows over the Arconia’s present.

Who is in the Only Murders in the Building season 3 cast?

The main trio remains intact, with Steve Martin, Martin Short, and Selena Gomez returning as Charles-Haden Savage, Oliver Putnam, and Mabel Mora respectively. Their chemistry continues to anchor the show’s tone of deadpan humor meets genuine suspense.

Main trio

• Steve Martin as Charles-Haden Savage (Only Murders Fandom Wiki cast)
• Martin Short as Oliver Putnam (Only Murders Fandom Wiki cast)
• Selena Gomez as Mabel Mora (Only Murders Fandom Wiki cast)

Guest appearances

Season 3 brings significant guest star power to the production. Meryl Streep appears as Loretta, an ambitious actress navigating the challenges of the theater world. Paul Rudd takes on the role of Ben Glenroy, whose presence sets the season’s murder investigation in motion (What to Watch season overview).

Summary

Only Murders in the Building season 3 delivers a self-contained mystery that also builds on the show’s established mythology. The addition of Meryl Streep and Paul Rudd elevates the production quality and signals the show’s continued ambition to blend celebrity spectacle with intimate character work. For viewers who enjoy solving mysteries alongside the trio, the season offers fair clues and satisfying resolution — and the confirmed season 4 means the Arconia’s secrets aren’t finished unraveling. Selena Gomez continues to anchor the ensemble with her understated performance as Mabel, proving the show can sustain intrigue across multiple iterations.

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Season 3’s killer reveal captivated fans with its ensemble including Meryl Streep, part of the broader full seasons cast roster that powers the entire series.

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