That is fine, but keep in mind that a valid answer to that question can be “No, it was a cat that did it.”.

If you are already sure it was a person and wanted to be specific, you could rephrase that as “Was the person who did this a man?”.

(The answer to that might of course be “I don't know, they looked rather androgynous.” or the more down to earth “Dunno. Couldn't tell if it was a bloke or a gal.”.)

I wrote a more detailed answer to GP: https://news.ycombinator.com/item?id=24576616, but basically: yes that's totally natural, but in edited writing / speech sometimes should be avoided for clarity reasons. But I didn't blink twice at the comment myself.