There has been persistent concern and speculation about Sean Murray's health since "NCIS's" 2010-2011 season (the show's eighth), enough that he took to the social media site Twitter to explain what's going on.

"To those who have asked what I did to lose the 25 pounds: 14 months of no alcohol and almost no sugar. Ate strictly organic," he wrote in September 2010. "You can actually see me gradually lose the weight over the 24 eps of Season 7. Slowly, a pound every week or two."

As for the change in his voice, there's been no official explanation, but a strict diet and a significant weight loss could possibly produce such a change.

So the takeaway, then, is that he's healthy. Which is good news, since he just got pretty busy again, after what was likely a stressful off-season.

Filming for the show's 10th season started on July 16. According to popular Hollywood-insider website Deadline.com, he only signed the contract to join the new season five days prior to filming.

To ensure that next summer won't be as stressful, he signed a two-year deal, as did co-stars Michael Weatherly (who plays Anthony DiNozzo) and Pauley Perrette (Abby Sciuto).

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