Yes, Joel Kinnaman and Mireille Enos are friends.
Mireille Enos is an American actress.
She is a 1997 graduate of Brigham Young University with a bachelor of arts in acting. While at Brigham, Enos won a prestigious acting scholarship known as Irene Ryan Award.
After making her screen acting debut in the television film Without Consent (1994), she got several guest-starring roles in many shows, including Sex and the City, Strong Medicine, Rescue Me, Without a Trace, Crossing Jordan, CSI: Miami, Medium and Law & Order: Criminal Intent.
Whereas Joel Kinnaman is a Swedish-born-American actor and model who first earned recognition for his roles in the Swedish film Easy Money and the Johan Falk crime series.
In a 2019 interview with Collider about her relationship with Kinnaman, Enos said, “he’s my brother. “He’s one of my dearest dear friends”. “That’s just kind of the magic that life handed us. We hadn’t met before we were cast together in The Killing. We met on the airplane to fly up to shoot the pilot”.
“And by the time we got off that three-hour flight, we were, like, finishing each other’s sentences. We were just easy together right from the start. And then we spent four years making that show, “Enos added.