First off,
I can not express in words how sorry I am for your loss. Suicide takes more lives than anyone wants to admit, and it seems all the people that should know even the remote start to a solution don't.

I will make my response brief.

First,
I think "Depression" is overdiagnosed (hear me out). Other disorders could have Depression linked/overlayed/similar.

The best Psychiatrist I had (he was a part of tons of cutting edge researchers with multiple Universities and companies), and he was STAUNCHLY against anyone in the "Bi-Polar Spectrum" being on any Antidepressant. Period. When I came to him and was Bi-Polar and also on an AD he immediately took me off. Said it is now known to be the biggest "no-no" in Psychiatry. Sadly, though, other psychiatrists will prescribe it.
I am not sure if this is "newer" information that Anti-Depressants can cause higher issues in those with Bi-Polar, or Psychs think they can outsmart it or what.

That is my only first-hand account of Anti-Depressants and Bi-Polar disorder.

All the best,
Matt