I have no experience in that area, but it's hard to see how a plain, factual statement "This person is no longer with the company." can be problematic.
That statement by itself wouldn't warrant an article, and it would be difficult to include a statement like that in a larger article about the event, without implying more than that.
Of course, if someone leaves because of personal reasons or jumping ship, there is no reason to do that. But this is different.