There's a Times obituary. It was cancer: https://www.nytimes.com/2020/03/03/nyregion/matvey-natanzon-dead.html https://www.nytimes.com/2020/03/03/nyregion/matve

There's a Times obituary. It was cancer: https://www.nytimes.com/2020/03/03/nyregion/matvey-natanzon-dead.html https://www.nytimes.com/2020/03/03/nyregion/matvey-natanzon-...