Metastasis
After being in remission, the cancer returned in 2005 and metastasized to Nielsen's liver and bones, but she continued to give speeches and traveled extensively including to Hong Kong, Vietnam, Australia, Ireland, Alaska, Poland, and she returned to Antarctica several times. In October 2008, Dr. Nielsen announced that her cancer had returned in the form of a brain tumour. She was active and giving talks until March 2009, three months before her death.
She died on June 23, 2009, aged 57 at her home in Southwick, Massachusetts. She was survived by her second husband, Tom Fitzgerald; her parents, Lorine and Phil Cahill; her brothers, Scott Cahill and Eric Cahill; and her children from a previous marriage: Julia, Ben and Alex.
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