Jim Parsons, 48, decided it was time to quit The Big Bang Theory between seasons 11 and 12, according to an interview he did with USA Today.

He told USA Today that the feeling came during the summer after season 11 ended.

"We went through the 11th season, and then that summer, I went to New York to do 'Boys in the Band' on Broadway, and I think anything I felt got really affirmed.”

He also attributed his leaving to the death of his dog and reflecting on the passing of his father.

Upon leaving the show, he told Big Bang writers Chuck Lorre and Steven Molaro that "if you told me that like my father I had 6 years left to live, I think there's other things I need to try and do."

Similarly, actress Kaley Cuoco, who played Penny on the series was asked by a fan on Watch What Happens: Live with Andy Cohen about Parsons’ decision to end the series.

The fan asked: “Were you disappointed when Jim Parsons' decision to leave the show ended The Big Bang Theory, when it could have gone on and on for many more years?"

To which she replied: "No, I think that is what he felt he needed at the time.