Murphy served on the budget-writing Appropriations Committee as well as the Higher Education Committee.
He is survived by his wife, the former Linda Dianne Dunton, and two children: Jennifer Alisha and William Quincy III.
House Minority Leader Stacey Abrams, D-Atlanta, emailed colleagues Friday to inform them of Murphy’s death.
Murphy, Abrams said, “was a vital, strong and essential member of our caucus family, and he will be deeply missed. We were blessed by his service, which spanned community, politics and business. Please keep Quincy’s family in your thoughts and prayers.”