Gunmen burst into the home of a political leader in the northern Mexican state of Durango and fatally shot him, two family members and an employee, authorities said Monday. Jaime Meraz Martinez, 63, a former lawmaker and an adviser to the left-leaning opposition Democratic Revolution Party, or PRD, was shot three times Sunday night and died hours later at a hospital, said Ruben Lopez, a spokesman for Durango state investigators. Lopez said the gunmen also killed 61-year-old Maria Meraz, the politician's wife; 34-year-old Jaime Meraz, his son; and Jorge Marquez, a 22-year-old taxi driver.