Those depositions are extremely stressfull. Add in years if not decades of emotional stress, prior. So yes, that can cause depression and can lead to suicide.

Another case where this happened was Therabis Edit: Theranos, obviously (my Pixel 7 keyboard and I won't become close friends any time soon): one of their lead scientists, who very much opposed cheating and their approach, developed a depression because of that and him being completely sidelined. He committed suicide the day before his scheduled depossition in a patent case.

Both cases are tragic, as is every suicide. Just because his death is convenient, doesn't mean in it was foul play...