From the other thread (Jim's last Github commit) it states he passed away due to a heart attack at age 57. [1] - https://news.ycombinator.com/item?id=7271909 h

From the other thread (Jim's last Github commit) it states he passed away due to a heart attack at age 57. [1] - https://news.ycombinator.com/item?id=7271909 https://news.ycombinator.com/item?id=7271909