The main cast of Only Murders in the Building Season 3 includes:

• Steve Martin as Charles-Haden Savage
• Martin Short as Oliver Putnam
• Selena Gomez as Mabel Mora
• Michael Cyril Creighton as Howard Morris (promoted to main cast in Season 3)

Special guest stars in Season 3 are:

• Paul Rudd as Ben Glenroy, a movie star whose death is central to the season's mystery
• Meryl Streep as Loretta Durkin, an aspiring actress cast in Oliver's play

Additional recurring cast members include Jeremy Shamos as Dickey (Ben's manager and adopted brother), Jesse Williams as Tobert (Ben's cameraman), and Ashley Park as Kimber (an actress in the play)

. This ensemble continues the story of the trio investigating murders in their apartment building while producing their own podcast, with Season 3 focusing on the death of Ben Glenroy during a Broadway play directed by Oliver