A fellow I worked with 40 years back and lost contact with for a log time started trading messages on F B around 8 years back . 
 Might be once a week or couple times a month , him telling of his latest fishing trip , or his offer to come out here with bow or shotgun and thin out the deer herd .
  Well last year he said he was selling his fishing boat as could not find anyone who wanted to go fishing with him now .
  His wife passes after a long illness about 6 months ago and every message kind of had a little mention of being alone . Some subtle hints of could not find anyone to play cribbage with or other hints of that type . 
  So yesterday I sent him a fishing mime on F B and couple hours later got a message from his daughter with his OBIT notice . Seems he passed away the day before . 
  Same age as I am and one wonders if a person should have done more , went out of the way to have more contact or got involved in his life more . Something one wonders about , the signs of another getting into the depression in life when their spouse passes , or they have other life altering events . 
  Now he had kids (now adults - and grandkids) so then again makes one wonder how in touch they were with their dad , and if they realized his depression . For his daughter mentioned he had not got over the passing of his wife , even though it was not always smooth sailing in their lives . 
  One takes friends for granted , and how much even staying in contact with others means in ones life . Staying in contact , or just sharing something to another can mean much and have a result you never may know fully how it effects another's life , or even your own .

In the last six years and since I retired lost nearly a dozen of those I once worked with. Guys I considered Healthy passed in their sleep or developed massive rapid progression cancers that took them in months. See people die in their 30s up to 50s for numerous reasons should not have and my old decaying body plods along. Guy that trained me decades ago at Feld Truck Rental passed and I was unaware that he died just prior to Covid, no one seems to care enough to let old contacts know.

Sorry for your loss Coke, that emotion is not lost here either.

Coke,sorry for the loss of your fellow worker. Yes,we do feel guilty that we couldn't do more. I know in my own life,I had one friend commit suicide and two co workers die of cancer shortly after retirement. The older I get,the more life throws curves at us!