FILE - In this 1999 file photo released by the National Science Foundation, Dr. Jerri Nielsen, a National Science Foundation physician, is shown at the ceremonial South Pole. Dr. Jerri Nielsen FitzGerald, whose struggle against breast cancer during a winter at the South Pole captivated the world, died Tuesday, June 23, 2009, at their home in Southwick, Mass, said her husband, Thomas Fitzgerald. The cause was cancer. She was 57.