'97 Blazer - Stalled and now squeaking

I have a '97 Blazer LT V6 4WD. It stalled on me this morning and wouldn't crank immediately after. My first thought was the alternator went out. I let it sit for a few hours and it started (reluctantly). It was running ok for a minute but then started squeaking intermittently before it stalled out again. The voltage looked fine on the gauge before it stalled the last time. Could this still be the alternator?