Under the pressure of that association, specifically Thadial Bokar, and the continued deterioration of their family life, Janel and Norvo were complicit in the murder of Morica Bilby, a friend of Miles O'Brien and the widow of an operative of the Syndicate. Because her husband had died on an assignment for the Syndicate, the organization's leadership said that she needed to be provided for. To that end, her name was added to the Tigan family business's payroll as a "shipping consultant" with no actual work involved. Morica kept pressuring the brothers for more money to maintain her silence. In the end, Norvo killed her.
Ezri ultimately uncovered her family's ties to the Syndicate and their role in the crime, helping to bring them to justice despite the pain it brought to the family. Ezri urged her brother to leave the family business behind and a find a new life elsewhere, promising him he'd be be happier somewhere else. (DS9: "Prodigal Daughter")