Roger Nolan was a former sergeant of the Baltimore Police Department's Homicide Unit. He was notable for being a Homicide Squad Supervisor, alongside fellow sergeants Terry McLarney and Jay Landsman, under the command of Lieutenant Gary D'Addario, whose work was featured in David Simon's Homicide: A Year on the Killing Streets book. A native of West Baltimore and a former Marine, Nolan joined the department in 1963 working in the State's Attorney's Unit, and the Western, Eastern, and Northwestern Districts, before becoming a supervisor in the department's Homicide Unit.