Marco was a terran who lived on Tarsonis, employed as a servant of the Terra Family. During this period, he fell in love with another servant, Dorris. However, he could never bring himself to express these feelings and never talked to her as a result.
In the end, he never did tell her, as their occupation lead to them to getting caught up in a terrorist raid on the family. They both died along with their attackers, courtesy of an unregistered telepath. His last thoughts were centered on Dorris, wishing that he had confessed how he felt.