Sierra McClain exited 9-1-1: Lone Star after season 4 last year, and her character's absence in the final season was explained by a new work opportunity onboard one of the Mercy Ships, which ...

When Sierra McClain didn’t return for 9-1-1: Lone Star ‘s fifth and final season, Grace’s absence was explained by her being off with Mercy Ships, which operates hospital ships that deliver ...

Grace's absence when Sierra McClain didn't return was explained with her character off with Mercy Ships.