Daniel "Dan" Frederick Hagan, 66, of Gaithersburg, Maryland passed away on April 21, 2022. He is survived by his father, Frank Hagan, and mother, Ann Christopher, his loving wife, Paula Hagan, his children, Jack Hagan and wife Danielle, Sean Hagan and fiancée Adrienne Thrasher, and sister Kathy Levine. He is also survived by his grandchildren, Robert and Brooks Hagan, and all of his lifelong friends from Elementary to High School.