I'm so sorry for your Cecilia. It's very very sad. Please take time for yourself, to adjust to this terrible situation.
I agree with your post title "He was one of us...".
Because I noticed when i was actively drinking, i thought about suicide a couple times a day. My body and mind was worn down, and small things easily wore me out and frustrated me. And i'd think "I hate my life". And i could easily convince myself that continuing on wasn't worth it.
Those feelings persisted after i quit drinking, but the strength of the feeling lessened as time went on. It's my personal feeling that drinking was causing my dark moods, because of the up-down-up-down cycle of drinking & hangover.
I also asked my doctor to prescribe an anti-depressent, and i stayed on that for 8 months. I tapered off them and luckily for me, i was able to stay off them.
But if i felt as blue as i used to, i'd go right back on them.
I'm mourning with you Cecilia. It's a tragedy and it's terribly painful.