why did mark harmon leave ncis

Most of the fans wants to know that is Mark Harmon coming back to NCIS?

As we all know that Mark Harmon  has left the NCIS but on recent rumors that we are hearing over the internet  that he is coming back

Before answering the answer for your question, let me share something which you must know

Thomas Mark Harmon is an American actor. He played the lead role of Leroy Jethro Gibbs in NCIS.

Well I know that you already knew more than me about Mark Harmon, Lets find the answer what you are looking for... 

Well, Is Mark Harmon coming back to NCIS? As I told there is some rumors  that he is coming back to NCIS finally 

Well there is no official announcement made that he is returning back to NCIS

But most of the fans are expecting his return to the NCIS