You can remove one potential suspect from your list for Only Murders of the Building season 4, as Jesse Williams has confirmed that he is not going to be returning for the new season that premieres on August 27.
Williams was one of the main guest stars in Only Murders in the Building season 3, playing documentarian Tobert who was working for Ben Glenroy (Paul Rudd) and who formed a connection with Mabel (Selena Gomez). After helping with the mystery, Tobert revealed he would be going back to Los Angeles at the end of the season, but seemingly left the door open for his and Mabel's relationship to continue.
