My Dad passed away suddenly, unexpectedly, July 6, 2005. My employer then, a small firm, was very understanding and sympathetic - urging me to take all the time I needed, if there was anything they could do, etc. and so on.
From that day on I was never the same. Once I returned to work, probably far too soon, there were days when I'd find myself staring at the screen, having forgotten what it was I had been doing. My coworkers would ask how Mom was doing, how the family was, those sorts of questions, and while I appreciated their concern, it made it harder to compartmentalize my mourning and simply focus on moving forward. Dad was in the Army National Guard, and our office was situated directly in the flight path of the helicopters he spent his life working on - sure enough, one would fly over the office, and I'd crumple into a weeping mess.
The sympathy and support and understanding continued, and I probably wouldn't be too far off the mark to say if they would have let me go they would not have been out of line. I simply never attained the same level of quality work and attentiveness that I'd had before Dad passed.
In all honesty, what got me through was a major relocation, clear across the country, jumping into a new life, new environment, everything. I believe if I had stayed where I was, in the same town, same job, same everything, I would have simply sunk further and further into the depression hole and likely not been able to drag myself back up out of it.
Where I am now, it's a fresh start. I miss my Dad every single day, and still mourn his loss and yep, still get weepy from time to time. But my job now.. no one knows he passed away. It's simply not an issue, not a subject that comes up.
Of course, uprooting your life and making a major move like have is not recommended for everyone :) It worked for me, and I'm glad and a smidge proud of myself for taking the chance and making the move. I think Dad would be proud, too.