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The 'Only Murders in the Building' Season 4 Ending, Explained

After learning Marshall is the killer they've been looking for, Charles is determined to save Mabel, especially since he didn't get to save Sazz. Realizing Marshall has scaled the apartment building in the past, Charles and Oliver wind up on the building's ledge so they can get to her window. And just like the rest of the season, Martin Short absolutely steals the show. One of my favorite lines is, "Charles, you're my ride or die. And my strong preference is to ride." Icon!!

Our favorite comedy duo jumps into Mabel's apartment and starts to fend Marshall off with Eva Longoria's Lady Longoria-19 in 1 Multi-Tool, but it doesn't take long for him to gain the upper hand. Right when he's about to kill the trio, they're saved by Jan of all people, who shoots him in the back from the empty apartment across the courtyard...then reveals she's been hiding in Charles' apartment since we last saw her. (Feel free to take a deep breath to help process that information. I did.)

With the threat taken care of, Mabel, Oliver, and Charles return to the Only Murders in the Building movie set — which Mabel says now has "mercifully low" cringe levels. Seeing Eugene Levy, Eva Longoria, and Zach Galifianakis in their element, and our podcast trio getting to honor Sazz's memory is such a well-earned moment for the season. We also get to see the first page of Sazz's script (which features her monologue from the beginning of the episode), on which she says, "When you take your hero on a journey, get him in all kinds of trouble, but land him home safely? Nothing better than that." It looks like our leads have finally landed safely!

The Only Murders in the Building ending features Oliver and Loretta finally getting married before she leaves to film in New Zealand, and Charles and Mabel joining Oliver at the altar. Loretta's walked down the aisle by her son Dickie and Oliver's son Will, which made me WEEPY. Considering Martin Short as Oliver is one of my favorite casting choices of the 21st Century, I am just so happy to see him happy.

But, like all the seasons before, the finale takes a turn when Sofia Caccimelio tries to hire the trio to find her husband Nicky, a Caputo crime family member who episode 9 tells us is missing. They deny her request, but considering actress Téa Leoni just joined season 5, it looks like she won't be taking no for an answer.

And in the final moments of the Only Murders in the Building season 4 ending, Mabel, Charles, and Oliver finds Lester dead in the fountain! Lester is such a kind and comforting presence in every episode, I can't believe it! (How could you Hulu, HOW COULD YOU?!).

Who's the killer in season 4 of Only Murders in the Building?

The Only Murders in the Building season 4 killer is Marshall P. Pope (whose real name is Rex Bailey), supposed screenwriter on the Only Murders movie. He reveals that his dreams of being a writer were always being squashed, and that Sazz was the first person who was ever kind to him.

But when Sazz shows him the only copy of her Only Murders movie, and he realizes just how good it is, he decides to take things into his own hands. He sends the script to Bev Melon at Paramount, and it ends up getting greenlit immediately (which explains why Charles, Oliver, and Mabel are contacted about the movie so abruptly).

When Sazz finds out, she confronts him and says she's going to tell Charles about the stolen script after his Broadway debut. Desperate and suffering a bit of a meltdown, Rex flies to New York and kills her, then puts her body in the incinerator.

Where can I watch Only Murders in the Building?

All episodes of Only Murders in the Building season 4 are available to stream on Hulu!

The O.C. follows Ryan Atwood, who moves in with the Cohens after getting kicked out of his mom's house, and starts a relationship with Marissa shortly after. While Peter Gallagher played Adam Brody's TV dad instead of Mischa's, Sandy was a definitely father figure for Marissa, and it seems like Peter felt that same responsibility off camera.

"I’ve always felt very protective of her," Peter told The Independent. "First fame is toxic. First fame can kill you. She was 16 years old when she started working with us, so just the fact that she’s still alive, I’m just so grateful."

“You can go to therapy every day for the rest of your life,” Mischa said in a 2023 interview with The Sunday Times. “There’s just a certain amount of trauma [from] all that I went through, particularly in my early twenties, that just doesn’t go away overnight.”

Josh Schwartz and Stephanie Savage revealed that season 1 overdose not only served as a cliffhanger, but gave “network executives an escape hatch on a performer they had been wary about” (via People). But Mischa Barton got her big break, becoming "how people knew the show," and (thankfully) Marissa recovered — only to die after a car crash in season 3.

As hard as that season 3 ending is to watch, Mischa did have the opportunity to watch it with Rachel Bilson and Melinda Clarke for the first time on their rewatch podcast. "It needed to be a thing, after everything she's been through, but if it's here I'll watch it with you," Mischa says.

"I couldn't do it, Mischa, I couldn't do it," Rachel adds. "But I'm going to do it if you're going to do it."

At the premiere, Danielle Fishel shared with PEOPLE that she was actually "back and forth" about showing up to the premiere. She said, "I obviously wanted to come tonight because I absolutely love this show. I'm so honored to have been able to direct a couple of episodes of it."

Still, there was something holding her back. She shared, "At the same time, everything I wanted to put on, I was like, 'I can see my scars in that. Oh, I can see my scars in that.'"

Instead of letting that hold her back, though, Danielle decided to push herself. "I was like, 'Why am I going to let that be a factor in deciding to live my life?'" she said. "I got dressed and I had my makeup artist do her magic and I feel fine." Ultimately, she said she was "happy" to be there — which is all you can ask for when you're facing down your fears!

Fishel told PEOPLE that her "whole life has changed" since her diagnosis. She explained that her life consists of "many doctor's appointments," check-ups, and side effects. She said, "It's not fun, but it is what it is. And with all that said, I'm very fortunate and I'm going to live, which is the most important thing."

Back in August, the star explained to Rider Strong and Will Friedle that was diagnosed with DCIS — ductal carcinoma in situ — which she described as "a rare form of breast cancer." Even though she discovered the disease at "technically stage zero," she underwent surgery to remove the cancer, as well as follow-up treatments.

When she announced her diagnosis, Danielle explained that she thought she would "would suffer in silence" and "not tell anyone." However, it's clear she's made the conscious effort to not only lean on her community, share her story, and brave the aftermath — surgery scars included.

Fishel's brave red carpet move comes after another fellow breast cancer survivor, Olivia Munn spoke out earlier in October about how her own scars. Munn bared her scars for a SKIMS campaign, after deciding she didn't wanna cover them up anymore. We're so proud of all these strong women for telling their stories and fully embracing themselves, scars and all!