Following the NCIS season 22 finale, NCIS season 23 is hinting at a major character change that could call back to the show’s earlier seasons. The NCIS season 22 ending featured several exciting events, with the darkest moment revealing that Parker’s father was killed by NCIS season 22’s villain, Carla Marino. NCIS season 23 could then build on this discovery by changing Parker in response to his father’s death.