What happen to Sean Murray (McGee) on NCIS?

Sean is not sick. He commented on his Twitter account. He's been eating healthy [cutting out snacks and eating a more vegetable based diet]. His weight loss has been healthy and gradual and can be viewed throughout season seven.

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RE:

What happen to Sean Murray (McGee) on NCIS?

He lost so much weight; did he diet or was he sick for a period of time? I think he looked better before.

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