Marquez first appeared on television in The Bill, where he portrayed Detective Sergeant Danny Pearce. He also had small roles in such series as Doc Martin, The Catherine Tate Show, Elizabeth I, The Business, EastEnders and Bedtime. From 2006 to 2009, he played the character of head barman on the television series Hotel Babylon. In 2013, he appeared in new ITV comedy drama The Job Lot, playing security guard Paul.