In Season 13 of "NCIS: Los Angeles," Chris O'Donnell and LL Cool J will continue to lead the series as G. Callen and Sam Hanna, respectively. Daniela Rush returns as Kensi Blye, a role she has played since the show's inception in 2009. Medalion Rahimi will reprise her role as Fatima Namazi, and Eric Christian Olsen will return as Marty Deeks, a fan favorite character. Linda Hunt, who plays Hetty, was absent for much of Season 12 due to the COVID-19 pandemic but has confirmed her return for Season 13. With the departure of Nell Jones and Eric Beale, the show has room to introduce new characters, including the promotion of Gerald McRaney's Ret. Admiral Hollis Kilbride to the main cast.