Battery's possible, as is the alternator. These diesels don't require any electricity to work once they're running, so it's entirely feasible that you had enough power to start last time but the battery was too drained to get another start, even though the engine was running fine...
I'd get the battery tested first, then see if there's a draw with everything shut off...if the battery's okay and you're not getting a draw (or only a tiny one i.e. radio memory, clock, etc), I'd suspect the voltage regulator.
Just some thoughts...good luck!
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