The Arconia has a way of making you feel like you've seen it all, and then it throws a wedding and a sniper into the same hour. Honestly, that's just a Tuesday for Charles, Oliver, and Mabel. By the time we hit the finale of season 4, "My Best Friend’s Wedding," the ensemble wasn't just big; it was basically a Hollywood convention held in a New York lobby.
If you were looking for a simple list of names, you’ve probably realized by now that this show doesn't do "simple." The Only Murders in the Building season 4 episode 10 cast is a weird, beautiful mix of A-list legends, deep-cut recurring favorites, and a few "wait, is that really them?" cameos that set the stage for season 5.
The Heavy Hitters and the Hollywood "Duplicates"
We have to start with the trio. Steve Martin, Martin Short, and Selena Gomez are the soul of the thing. But this season added a bizarre layer by casting people to play them.
In the finale, we get to see Eugene Levy, Zach Galifianakis, and Eva Longoria really lean into their "fictionalized" versions of themselves. They aren't just background noise. They actually help the investigation. Remember that 19-in-one multi-tool Eva Longoria’s character kept bragging about? It actually becomes a plot point when Charles uses it to disarm the killer.
It's meta. It's confusing if you haven't had your coffee. But it works because these actors are playing versions of themselves that are just slightly more annoying and "Hollywood" than the real people.
The Guest Stars Who Stole the Show
Meryl Streep returned as Loretta Durkin, finally getting her big wedding to Oliver. It was a rare moment of genuine sweetness in a show that usually focuses on blood spatter and podcast sponsorships. Seeing Meryl Streep in a wedding dress in the middle of a murder mystery is the kind of TV magic only this show pulls off.
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Then there’s the killer.
Jin Ha, playing Marshall P. Pope (or Rex Bailey, if we’re being precise), put in a massive performance. He had to pivot from being this insecure, "I'm just a writer" guy to a cold-blooded murderer who was actually a disgraced stuntman. Most people think the killer is always a guest star from episode one, but Marshall’s slow burn throughout the season was a masterclass in hiding in plain sight.
Who Actually Showed Up in the Finale?
When you look at the Only Murders in the Building season 4 episode 10 cast, it's helpful to break down who was actually on screen versus who was just a voice or a flashback.
- The Main Trio: Steve Martin (Charles), Martin Short (Oliver), and Selena Gomez (Mabel).
- The Hollywood Trio: Eugene Levy, Zach Galifianakis, and Eva Longoria.
- The Wedding Party: Meryl Streep (Loretta) and Ryan Broussard (Will Putnam).
- The Westies: Richard Kind (Vince Fish) and Kumail Nanjiani (Rudy Thurber) provided the necessary distraction to help save Mabel.
- The Law: Da’Vine Joy Randolph (Detective Williams) is basically the only competent adult in this entire universe.
- The Surprise Return: Amy Ryan as Jan Bellows.
Jan Bellows showing up was the "chef's kiss" moment. She’s been hiding in Charles’s closet for weeks. Think about that. While Charles was mourning Sazz and making omelets, his psychopathic ex-girlfriend was just... there. Behind the coats.
That Final Scene Cameo
The biggest shock for the future of the show was Téa Leoni as Sofia Caccimelio. She walks in right at the end, looking like she stepped out of a noir film, asking the trio to find her husband. It’s a total shift in tone. She’s not an Arconia resident (yet), but she’s the bridge to the next season.
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The Mystery of the Stunt People
We can't talk about this episode without mentioning Jane Lynch. Even though Sazz Pataki is dead, she is the heart of the finale. We see her in flashbacks and as a "vision" to Charles.
The reveal that Sazz actually wrote the movie script—the one Marshall stole—adds a layer of tragedy. It wasn't just a murder; it was intellectual property theft at the highest, most violent level. Paul Rudd also appeared as Glen Stubbins (or at least, his spirit/legacy/Irish chaos), reminding us that the stunt community in the OMITB world is a tight-knit, slightly unhinged group.
What People Get Wrong About the Finale Cast
A lot of fans were searching for "who played the doorman" after that brutal ending. That’s Teddy Coluca as Lester. He’s been a background fixture since season 1. Seeing him meet such a grim end was actually one of the darker turns the show has taken.
Some viewers also missed the "Brothers Sisters" (Catherine Cohen and Siena Werber). While they were major players earlier in the season, the finale focused more on the personal resolution for the trio and the wedding.
The cast isn't just a list of celebrities; it’s a machine where every gear has to turn. If Richard Kind doesn't show up with his eyepatch to distract Marshall, Mabel doesn't survive. It’s that simple.
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Moving Forward: Season 5 Implications
The Only Murders in the Building season 4 episode 10 cast leaves us with a lot of questions. Since Loretta is heading to New Zealand for her show, will Meryl Streep be a series regular in season 5? Probably not. She’ll likely be a "FaceTime guest star" like she was for parts of this year.
But Téa Leoni is clearly the new North Star. Her character, Sofia, mentions the "Caccimelio" name, which sounds like organized crime is coming to the Arconia.
If you're trying to keep track of everyone, here’s the reality:
- Jan Bellows (Amy Ryan) is back in custody, but she’s never truly gone.
- Lester (Teddy Coluca) is out, which means the building needs a new doorman (and a new murder investigation).
- The Movie Stars (Levy, Galifianakis, Longoria) finished their "filming," but the movie itself is still happening using Sazz's real script.
The best way to prep for what's next is to re-watch the scenes with the "Westies." Their chemistry with the main cast was so good that it’s hard to imagine the show without Richard Kind popping in to be grumpy.
Keep an eye on the casting announcements for season 5. If Téa Leoni is the starting point, the guest list is only going to get more crowded and more famous from here.
Next time you're watching, pay attention to the background characters. As Lester’s death proved, no one is safe, and anyone can become the next plot point. You might want to look back at earlier episodes to see if Sofia Caccimelio’s husband was ever mentioned in passing—this show loves a long game.