This guy was an Imperial Officer. Lieutenant Dommaro was part of the Death Star's security sector. He was in charge of the A68 Market, a notorious Black Market located on the battlestation (Yes, the Death Star wasn't just a superweapon...).

That's literally all we know of him, it's likely Dommaro was killed when the Death Star was destroyed, or perhaps he was even demoted or executed due to his affiliation of the controversial market. He was first mentioned in the Death Star Technical Companion. We do not have any images of Dommaro, but perhaps this guy is him