2007’s Hitman is an adaptation of the beloved stealth video game and was Timothy Olyphant’s first leading movie role, but Olyphant never returned for the 2015 follow-up, Hitman: Agent 47. The first movie follows Agent 47, a cloned super-assassin who uses stealth mechanics and creative methods to take out his targets. The game was often seen as a perfect story for a movie adaptation. Unfortunately, the 2007 Hitman film failed to impress critics or fans of the game.

https://screenrant.com/hitman-agent-47-timothy-olyphant-not-return-reason/