Hi Ken, so sorry to hear the bad news, thinking of you buddy.
In regards to
Is this common in todays congregations? No one knows why he did this.
I only know of 2 brothers who sadly did commit suicide, one of them would be the last person you would pick. He was in my pioneer school and the last time I saw him was at the Sunday meeting, he was an MS, answering up, doing mike duty, looked very happy. Yet was suffering from depression as most JW's do.
There was also a spate of suicides amongst jw's back in the late 80's in Sydney including one at Bethel, though I do not know of the facts. I think it would definitely help you personally to go to the Memorial. Stay safe. Mattieu.