I loved the old Kung Fu series. I was quite young when it was out. It was probably one of my most earliest martial art influences and sparked my interest from karate to CMA, particularly Shaolin.
David Carradine has had constant struggles from what I understand. He is honest and open about them. I watched a special on him one night on "E" television. They did a biography on him. He has had some problems and at one point he was too caught up in the character he played in the Kung Fu series.
I did read some articles that he was studying martial arts now even though he never really had a martial arts background.