Frederick County is mourning after a firefighter died Wednesday in the line of duty.The Career Firefighters Association of Frederick County, Maryland, said firefighter Zachary Paris died while battling a house fire Wednesday night in Schuylkill County, Pennsylvania.The fire union said Paris was one of two firefighters who died while fighting a fire with the New Tripoli Fire Co.According to the union, Paris joined the Frederick County Division of Fire and Rescue Service on Feb. 28, 2022. He graduated on Sept. 10, 2022, and was assigned to the Green Valley Fire Station.Paris leaves behind his wife and two young daughters.