Chicago Fire is finally making Sam Carver (Jake Lockett) a series regular in season 13, giving the multi-season firefighter a bigger role in the series since his debut. Carver was first introduced in season 11 as a former rival of Stella Kidd during their time at the academy together. While it takes some time for him to get used to working with the team, partially due to trust issues, he soon becomes a valued member. This takes on a new form at the end of Chicago Fire season 12, when he ends up in a relationship with Violet.
https://screenrant.com/chicago-fire-season-13-cast-jake-lockett-carver-series-regular/