NCIS Mark Harmon : TV Hero Is Big Zero

Mark Harmon plays a good guy on his hit NCIS crime drama, but in real life the TV investigator is a coldhearted jerk with a history of chasing skirts, insiders say! 

The 65-year-old former UCLA quarterback, who plays Special Agent Leroy Jethro Gibbs on the world’s most-watched drama, is far from the “fair-minded hero he plays on TV,” says a source.

“Mark can be a total jerk!”

Currently, his dirt-poor sister Kristin Nelson, 72, is recovering from a serious illness in Los Angeles after being released from a Santa Fe hospital. But Mark has so far refused to visit her or to even pick up the phone.

Find out what the actor was like behind the scenes.