Of cancer, in Los Angeles. He was 53.
http://www.sfgate.com/cgi-bin/article.cgi?f=/n/a/2008/12/18/entertainment/e122933S45.DTL&tsp=1
I always thought the reason his character survived in Apocalypse Now was because of his living in the moment approach to life. Truly a small, but memorable role.
[the boat has arrived at the Do Lung bridge, which is a combat zone]
Chef: Lance, hey Lance. What do you think?
Lance: It's beautiful.
Chef: What's the matter with you? You're acting kinda weird.
Lance: Hey, you know that last tab of acid I was saving? I dropped it.
Chef: You dropped acid?... Far out.