For a second there, I thought it was another cricket dying in a short space of time...
I didn't immediately recall the name, but when I read a few of his roles, I knew exactly who it was... and I think the roles I remember most include Tron (the main villain), Time Bandits, Star Trek (multiple roles, but Chancellor Gorkon in ST6 was one that stood out for me), one of the original TMNT movies, Titanic (the one who locked up Leonardo's character hoping he would go down with the ship), and had quite a few roles in Doctor Who as well (most being voice roles).
But Tron will be the one I remember him best from... the perfect villain.