The original one, that is - Richard Hatch, back in the 1970s when Battlestar Galactica was cheesy, and cost $1 million an episode. He had pancreatic cancer.
Gosh, I fancied him in Battlestar Galactica. He was never cheesy, just some of the stuff around him - Captain Apollo was always noble and heroic (and I was a soppy teenager). I even liked him in The Streets of San Fransisco, when he replaced Michael Douglas.