Yes, Fredfa if you discount the original introduction to the series which was a Jag show. But as I said, Kate Todd was part of the show as a Secret Service agent, not as part of the original NCIS team.
BTW- to all who don't like Dinozzo's character because he's a sexist personality, I checked with the CBS poll and it seems he has a 57% favorable rating among viewers. But it must concern CBS otherwise why have a poll on his personality and not the others?
Personally, I believe the show would be too boring if he were not part of it. The "original" 4 person team each offers a unique personality to the show. McGee is an extra who is torn between wanting to be a techie like Abby and a street smart investigator like Dinozzo. Kate Todd was always fascinated with Gibbs (I believe) and wanted to like his jar head like get the job done attitude while deep inside actually liked the spars with Dinozzo. I think DB wrote her character as a Say no but I mean yes kind of woman. There were a few episodes where her hidden life became known to Dinozzo if you recall.