I just had a similar problem!
What happened to mine was that A/C compressor seized.
A few days prior - It made a ton of noise, like a bearing going...whining and grinding...sputtering and stalling several times when I came to a stop....and last night it died. Siezed right up...couldn't start the car, it stopped the belt dead.
Get your car running and look at the A/C compressor....look to see if the clutch plate is rotating properly...you will notice right away if it is not.
You have two options if it is your A/C
1. New compressor $1,600 CDN supply & installed
or
2. A new belt which bypasses the compressor $126 supply & installed.
Good luck