 Sitzman was born in Lafayette, Colorado and attended the University of Colorado at Boulder before moving to Dallas.After moving to Dallas, Sitzman got a job as a receptionist at dress manufacturer Abraham Zapruder's clothing company Jennifer Juniors.Zapruder's clothing company was located in the Dal-Tex Building at 501 Elm Street, one block from Dealey Plaza through which the presidential motorcade would be passing on November 22.