Terrible shame.
I lost my aunt that way. The firearm was a shotgun, and what was left was discovered by her grandson. This shouldn't happen given the remedies available for depression, but the ideation of suicide is singularly distinct with some imbalances, i.e. coming off some SSRIs. I had a coworker who, even though religious, came off Prozac and felt compelled to kill his wife and then himself. Years later I saw my coworker describe it all on an anti-depressant propaganda video by Scientology.