For the record:

1. Car was full of oil.
2. Never lost any oil pressure on the gauge, nor did it even fluctuate.
3. Never overheated.

It is possible that it is not a bearing issue. I am pulling the oil pan to see what's going on. The engine will turn, but makes a loud scraping noise once per revolution . When it failed, it began making a loud clattering sound, 20 seconds later I pulled on to the shoulder and it died--and would not turn over. I thought it had seized. But the next day it did turn over. I drained the oil and found small flakes of what looks like bearing material--appears to be aluminum, but not certain. Doesn't look like steel. Will try a magnet. Did find some steel filings in the oil filter housing--but few and very small. Could have accumulated there for a while.