"Chicago Fire" has confirmed the departure of long-serving cast member Dermot Mulroney and introduced a new Firehouse 51 recruit for Season 15, continuing the show's pattern of regular cast turnover while retaining its core ensemble. The move follows hints last season that Mulroney's character might exit after Rob Morgan was brought in as a temporary chief, with his departure now confirmed as production on the new season gets underway.

Actor Da'Vinchi has joined the cast as Marcus Burke, a firefighter recruit described as roguish, funny and slightly defiant. He previously starred for four seasons in Starz's "BMF" and is set to appear in two upcoming Tyler Perry Netflix projects. Da'Vinchi shared behind-the-scenes photos of his new role on Instagram, drawing supportive comments from fellow actors including former guest star Rome Flynn.