I only heard with sadness a few days ago that Boothe had died, heck he was only 68!
His favourite role for me was as the National Guardsman in 'Southern Comfort', a great example (along with Keith Carradine) of how to keep your sh*t together when the rest of the unit are falling apart all around you.
A great line is when Boothe says-
"I dunno how I'm gonna do it, but I'm gonna fight my way outta this"
PS- I found this 'Dead or Alive' website which is useful for finding out who's still with us or not-