Lars Quell/Lord Vadiar

"Do what you want, Vader. It's your Empire, is it not? That doesn't mean people won't betray you, however..."

- Lars Quell, aka Lord Vadiar to Darth Vader on the Executor.

Lars Quell was a simple man who transported spice freighters, until one faithful battle on Coruscant led to him becoming a General in the Galactic Republic's Military.

Post-mortem
He died from suicide bombing one of Vader's Star Destroyers, as Vader was on it.