Of that show, I like Grant the most. I was hoping I will see more shows from him in the future.
RIP, Grant, we'll miss you.
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Brain aneurysm is scary.
Indeed.
I presume no warning, just 
Regarding warning or signs -- I think it is perhaps case dependent, and likely the most significant factor is where exactly the aneurysm was.
Some years ago,
I had a co-worker who died of the same thing with a late and non-specific warning. On the day he died, he was taking the day off to see the doctor the second or the third time - to have
another scan to narrow down what was wrong. He did not live long enough to get to the doctor that day. His aneurysm "burst" and from the condition his wife found him in, his death would have been rather quick - just slump over, in front of his laptop.
Recalling when he
first talk of not feeling well, that must have been
a little over a week before his death. I spoke to him 8:30am on the day he died. I certainly did not discern anything wrong. He sounded so normal I thought he was just lazying out that day and I was rather annoyed that he asked me to call the customer on his behalf -- he knew I was off-site dealing with the technical end, and calling the customer was his job. I often feel bad I was so annoyed at him (and I let my annoyance shown). That was my last conversation with him, and that was on his last day, and I was annoyed at him... Years later, I happen to drove by that town. I recall where the grave was, I found it and I spend a moment with him.
With his sudden death, we (on the project team) did wonder had the doctors been able to narrow down to aneurysm sooner, would he still be around.