Keegan-Michael Key Joins Season 5 of “Only Murders in the Building” as Episode 4 Drops Today

DETROIT/NEW YORK, Sept. 16, 2025 - Keegan-Michael Key appears in the fourth installment of Hulu’s hit mystery series Only Murders in the Building, which premieres today on Disney+ and Hulu as part of its weekly rollout. The actor’s addition to the star-studded ensemble marks the first major guest-starring role of the season.

Nut Graf Key’s recurring turn adds fresh intrigue to the beloved whodunit, which blends comedy and suspense around a murder investigation at Manhattan’s Arconia. His casting underscores the show’s strategy of enlisting high-profile talent to sustain fan excitement and critical acclaim as the season unfolds.

Weekly Release Schedule

Episode 4 - Tuesday, Sept. 16, 2025
Episode 5 - Tuesday, Sept. 23, 2025
Episode 6 - Tuesday, Sept. 30, 2025

Key’s Role and Production Filming for Season 5 began in March 2025 in New York, reuniting leads Steve Martin, Martin Short, Selena Gomez and Michael Cyril Creighton. Key’s character details remain under wraps, but insiders say his involvement raises the stakes as the trio digs deeper into Lester’s fate.

Foster Care Advocacy In related news, Key used his platform yesterday to spotlight foster-care support in an Instagram reel, declaring, “I wouldn’t be here with you today if it wasn’t for foster care,” and encouraging followers to consider becoming resource parents.

Looking Ahead As Only Murders continues its episodic drop, viewers can anticipate more guest stars and plot twists with each Tuesday release, culminating in a season finale on Oct. 28.