I don't believe it has been confirmed. I can only find reports of his "multiple identities + passports."IIRC, it was mentioned before that the husband has a dual citizenship (also nationality and citizenship aren't the same). He likely wasn't a US citizen at the time he got married at 22. He went to university in Europe.
Also, this article uses the phrase "David, of Serbian origin"
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Three weeks since the disappearance of Ana María Knezevich in Madrid: what authorities know so far
Ana María Knezevich has been missing for two weeks, with no trace on her bank or phone records. What we know so far...