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‘NCIS’: Could Gibbs Have a Brain Tumor?

During the final episodes of NCIS season 16, we see Gibbs (Mark Harmon) exhibiting some strange behavior. He’s talking to the ghost of his dead ex-wife, Diane, being short with his team, and acting quite weird. What’s going on with Gibbs? Here’s why fans think Agent Gibbs has a brain tumor. Some think Gibbs is …