"Bug me again, and I'll kick your ass over the Canadian border." Out of the three Halstead siblings, the youngest is the most unpredictable one. Lucia-Marie isn't the sibling Will and Jay talk about or mention off the top of their head very much. In fact, she hasn't lived in Chicago for nearly seven years, nor has she visited. She's many things; twenty six, the only blonde in the family, a cop, a fed, a victim. But it seems that once Lucy returns to Chicago, she's not only trying to escape her demons, she's also looking for a new job. So it's only fitting that she get the free spot on the Intelligence team.