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It appears that David Tweed, once active in the Azimuth Project, has ended his own life. This is very sad. He was a great guy. I knew he was suffering from depression.
On Google+ we read this post on his account:
David chose to leave the world on 12/1/2017 and as his last wish was to ensure that his donation arrived at Kick Starter Project. We would be grateful if anyone could confirm this. The Family of David Tweed.
He indeed contributed $500.