Only Murders in the Building Season 4 killer explained

Jane Lynch in Only Murders in the BuildingHulu

Only Murders in the Building Season 4 has drawn to a close, meaning we now know the killer, the motive, and their ultimate fate, plus the Episode 10 victim.

Only Murders in the Building stars Steve Martin, Martin Short, and Selena Gomez as a trio of mismatched podcasters investigating death in their New York apartment block.

At the end of Season 3, stuntwoman Sazz Pataki (Jane Lynch) was shot dead from across the building. Meaning Season 4 finds Charles, Oliver, and Mabel endeavouring to solve that crime.

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And now we know whodunnit and why, so beware of SPOILERS ahead…

Only Murders in the Building Season 4 ending explained

Aspiring screenwriter Marshall P. Pope murdered Sazz Pataki, so he could steal her Only Murders in the Building script, and pass it off as his own.

Before assuming the Pope pen name, he was Rex Bailey, a stunt performer whom Sazz took under her wing, before a disastrous fire gag sent him down a different path.

In Episode 10, we learn that he and Sazz exchanged scripts to give each other notes. But then Pope/Bailey pretended that he had written Pataki’s.

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When that Only Murders script was fast-tracked into production, Sazz found out and threatened to expose him. So he killed Pataki by shooting her.

Marshall P. Pope, aka Rex Bailey, in Only Murders in the Building.Disney

Charles, Oliver and Mabel figured this out at the end of Episode 9, and Mabel confronts Pope in Episode 10, at which point he takes her hostage.

Charles and Oliver spring into action and wrestle Pope’s gun from him, but he grabs it back using his stuntman skills. So it’s left to Jan to save the day, shooting Pope in the back from across the building, having been hiding in its passageways and walls for the previous three weeks.

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Oliver and Loretta then get married and they all live happily ever after. Until the trio find their doorman Lester dead in the fountain, setting up the Season 5 mystery.

Only Murders in the Building will be back in 2025. While you’re waiting for that return, check out our list of the best TV show of 2024 so far, or the best TV shows out this month.