From recent interviews with Sean Murray (McGee)
He has stated emphatically there's absolutely nothing wrong with him, he lost nearly 30 pounds by staying away from heavy deserts, sugar and alcohol. He really is not ill and feels 100%.
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Mcgee isn't really that skinny. He is normal size.
In Season 7, he says he's going to lose weight and when his co-worker, Anthony Dinozzo, questions him about his weight, he reveals he has lost 15 pounds, but in all the preivous series, he is "overweight".
Actually speaking, he is perfectly fine. He does not have any health issues. He has just lost some weight and that is why people are tempted to think that he is sick. The good news is that, he is healthy and just fine.
McGee plays a lot of tactical warfare computer games. Timothy McGee is portrayed by Sean Murray in the show, NCIS.
Sean Murray is the actor who plays Timothy McGee on NCIS.
McGee's first episode was #7, "Sub Rosa".
The character McGee is a graduate of MIT, the Massachusetts Institute of Technology.
I believe that he is 28... i did the math in one episode... Edit: It is impossible for McGee to be younger than 37, since you need to be 37 to become an NCIS agent :)