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Jan Paul van Waveren passed away today. The best developer I ever worked with, my right hand, and a good friend. It was an honor.
Source: John Carmack, 31 Jan 2017.

Two days late. I've found out about it today and I'm still shocked. He was still very young.

He was the author of Quake 3's bots (and wrote his master's thesis about them) and worked on all other id Software games after that until he followed John Carmack to Occulus. I've spend a lot of time with the results of his work.