From Jeff's obituary in The Press Democrat:
Jeffery R. Demarest—biologist, naturalist, world traveler, great cook, and bon vivant—passed suddenly and unexpectedly on January 12, 2022, at his home in Healdsburg, CA. Martha Noble, Jeff's wife of 36 years, was beside him. He is dearly missed by his wife, countless friends, and colleagues from across the country and beyond.