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

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.”.)