Four seasons in, andOnly Murders in the Buildingcontinues to catch audiences by surprise with its murder mysteries and the captivating trio inspecting them. The Arconia neighbors are now tasked with finding the person responsible for the death of a close friend, all the while they ponder whether to accept a picture deal with a major studio to adapt their podcast into a movie.

As Oliver (Martin Short), Charles (Steve Martin), and Mabel (Selena Gomez) take on another gripping investigation, many new characters will join in on the whodunnit thrill.To find which A-listers are set to make cameos this season, here is a handy cast and character guide.

Charles-Haden Savage, looking confused, superimposed on a swirling background

VIDEO: ‘Only Murders in the Building’s Three Best Plot Twists So Far

What does Season 4 have in store for our beloved trio?

Martin Short

Oliver Putnam

Known for coming up with one of Broadway’s greatest flops, Oliver Putnam is part of the main trio behind the true-crime podcast “Only Murders in the Building”. Although the character is still trying to dote on a lavish lifestyle, he isn’t as financially stable as he once was. With his dog Winnie at his side and the podcast to keep him busy, he is always excited about solving another murder case and his enthusiasm usually keeps Charles and Mabel invested in their investigations. This season, Oliver and his colleagues will be unveiling the killer responsible for Sazz Pataki’s (Jane Lynch) death.

Martin Short plays the enthusiastic Oliver, and he is no stranger to being on a hit TV show. FromSCTV(where he had the chance to create his well-known alter egos Ed Grimley and Jackie Rogers Jr.) toThe Morning Show, the actor has been featured in quite a few series before getting to play the lead in the Hulu original. With two Primetime Emmys under his sleeve and a Tony, Short has an illustrious career. Some of his most beloved projects were alongsidehis co-star Steve MartininThe Father of the BrideandThree Amigos.

Martin Short as Oliver Putnam stands in his apartment in Only Murders in the Building Season 3, Episode 3

Steve Martin

Charles-Haden Savage

Much like Oliver, Charles is no longer in his prime career wise. His most notable performance remains that of the lead character in “Brazzos”, a ’90s hit. As a semi-retired actor, he has lots of spare time to solve crimes through the podcast he produces with his neighbors. Season 3 will focus on his long-term friendship with the murder victim (who happened to be his stunt double), with Collider’sRemus Noronhaeven calling their flashback scenes together “the most heartbreaking scenes in the season”.

A prominent comedian, Steve Martin, played several iconic characters throughout the years before starring as Charles in OMITB, including Orin Scrivello inLittle Shop of Horrorsand Inspector Clouseau inThe Pink Panther(a movie he also co-wrote). With a career filled with impressionable performances, many of which have gained classic status, it is easy to understand why he’s earned an honorary Academy Award. Aside from his onscreen achievements, Martin has been a Grammy-winning musician and a successful stand-up artist since the ’70s. He has hostedSaturday Night Livea total of 16 times.

Jane Lynch standing in a kitchen in Only Murders in the Building

Selena Gomez

Mabel Mora

Mabel is not only the youngest member of the podcast trio, but also the most grounded. Like her two elderly friends, the character also lives in Arconia and cuts to the chase when it comes to solving cases. In fact, her drive to be objective when piecing out clues led her to distance herself from Oliver and Charles in Season 3, only reuniting with them after they were 100 percent focused on finding the killer. This time around, Mabel won’t have any romantic entanglements to distract her from their new investigation and will be much more in touch with herself and what she wants to do next.

Selena Gomez started out as a child actress inBarney & Friends, and rose to fame as the lead in theDisney Channel seriesThe Wizards of Waverly Place. Since then, she has juggled multiple hats, from starring in films likeSpring BreakersandRamona and Beezusto consistently putting out pop tunes like “Love You Like a Love Song” and “Same Old Love”. In addition to playing Mabel, Gomez also hosts cooking shows and owns a leading beauty product company called Rare Beauty. She most recently earned a Cannes for her role inEmilia Perez, a film set to release on Netflix later this year.

Meryl Streep as Loretta Durkin smiling, sitting down at a table read in Only Murders in the Building Season 3

Jane Lynch

Sazz Pataki

As previously mentioned, Sazz Pataki is Charles’ old friend and his stunt double who got murdered in cold blood. Season 4 will be all about getting to the bottom of who killed her at Charles' apartment and what was the motivation behind this gruesome act.

Before playing Sazz, Jane Lynch was popularly known for her role as the evilcheerleading coach Sue SylvesterinGlee(a performance that landed her an Emmy). She was also a recurring star in several other TV hits, includingTwo and a Half Men,The Good Fight, andThe Marvelous Mrs. Maisel.Prior to OMITB, Lynch also worked alongside Gomez in a Cinderella adaptation calledAnother Cinderella Story.

Da’Vine Joy Randolph in Only Murders in the Building with a straight face.

Meryl Streep

Loretta Durkin

After being introduced in Season 3, Loretta Durkin is back, and she is even more enamored by Oliver. Although their relationship blossomed mid-investigation, with Loretta being a suspect in Ben’s (Paul Rudd) death, her and the Broadway alum have seen their connection evolve into romance.

Meryl Streepneeds no introduction. A Hollywood legend with over 21 Academy Award nominations (and three wins), the actress is best-known for work in films likeKramer vs. Kramer,Sophie’s Choice,Mamma Mia,Out of Africa, andThe Devil Wears Prada. The latter will have a sequel soon, meaning thatStreep will be back as Miranda Priestlyin no time.

Da’Vine Joy Randolph

Detective Donna Williams

Detective Donna Williams appeared in only one episode last season, but that is no indicator of her leaving the show for good. The killjoy cop who gets in the way of the main trio’s podcast investigation, is back in action.

Da’Vine Joy Randolphnot only received an Emmy nomination for her portrayal of Detective Donna Williams, but she also recentlyearned an Oscar for her supporting roleinAlexander Payne’sThe Holdovers. Aside from the Hulu series, she also appeared in shows likeThis Is Us,High Fidelity, andThe Idol.

Molly Shannon

In addition to uncovering the truth about Sazz Pataki’s death, the trio of amateur detectives is also overwhelmed by the fact that their podcast is getting adapted to the big screen, with Paramount Pictures producer Bev Melon looking after the production.

Like Martin and Short,Molly Shannonwas also part ofSaturday Night Live.She has also starred in multiple films and TV projects, includingNever Been Kissed,Hotel Transylvania(alongside Gomez), andThe White Lotus. Before guest starring in the Hulu series, Shannon also worked on a Max comedy calledThe Other Two.

Melissa McCarthy

Melissa McCarthy’s character doesn’t have a name so far, but it has been revealed thatshe will play Charles' sisterin Season 4.

The actress has come a long way since playing Sookie St. James inGilmore Girls. Since then, she has been nominated for an Oscar twice for her roles inBridesmaids, andCan You Ever Forgive Me?She also hostedSaturday Night Livefrom 2011-2017, winning a Primetime Emmy Award for her guest appearance.

Eva Longoria

In the podcast adaptation for the screen,Eva Longoriais cast as Mabel. The latter feels flattered to have a beautiful actress playing her in the upcoming movie.

A former soap opera star, Longoria began her onscreen career inThe Young and Restless, followed by her portrayal of socialite Gabrielle Solis inDesperate Housewives. For a while, the actress was working behind-the-scenes, but she just recently returned to TV withthe Apple TV+ originalLand of Women.

Eugene Levy

Eugene Levyis also making a guest appearance this season as himself. The actor has been selected to play Charles in the film about the podcast. Much like Mabel, Charles is thrilled to have a notable comedian playing him onscreen.

Prior to OMITB, Levy worked alongside Short on the Canadian sketch series SCTV. He also collaborated with Martin inCheaper by the Dozen 2and Lynch inBest in Show. Yet, the actor is better known for playing the Rose patriarch in the Emmy-winning sitcomSchitt’s Creek.

Zach Galifianakis

Yet, different from the aforementioned, Oliver isn’t so sure thatZach Galifianakisis the right person to play him in a movie about the trio and their crime podcast.

The actor is better known forplaying Alan inThe Hangovertrilogy and Chip Basketsin the FX seriesBaskets.

Kumail Nanjiani

Similarly to McCarthy,Kumail Nanjiani’s character has yet to be disclosed, but according to reports from when the actor was originally cast, he will have an integral role in the ongoing investigation.

Prior to the Hulu original, Nanjiani played Dinesh in the HBO comedy seriesSilicon Valleyand Steve in the miniseriesWelcome to Chippendales.

WatchOnly Murders in the BuildingSeason 4 on Hulu.

Only Murders in the Building

Three strangers in a New York City apartment building bond over their shared interest in true crime and form an unlikely team to investigate a suspicious death in their complex. Their amateur sleuthing quickly evolves into a thrilling quest as they navigate secrets, lies, and unexpected twists.

Watch on Hulu