What is mark harmon death?

As of my knowledge cut-off date in October 2021, Mark Harmon, the American actor best known for his role as Leroy Jethro Gibbs on the television series "NCIS," is still alive. There is no reliable information or reports indicating that Mark Harmon has passed away. If there have been any developments regarding Mark Harmon's death after October 2021, I would not have access to that information.