Bill Richardson, the former Democratic New Mexico governor and United States Ambassador to the United Nations, died at the age of 75.

In a statement on Saturday, the Richardson Center for Global Engagement, the organization he founded and led, said he died in his sleep at his home in Massachusetts.

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“He lived his entire life in the service of others — including both his time in government and his subsequent career helping to free people held hostage or wrongfully detained abroad,” Mickey Bergman, the center’s vice president, said in a statement to the Associated Press.

“There was no person that Gov. Richardson would not speak with if it held the promise of returning a person to freedom. The world has lost a champion for those held unjustly abroad and I have lost a mentor and a dear friend.”

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After his political career, Richardson dedicated his life to freeing Americans who were detained overseas.

Prior to his time as governor, Richardson worked as former President Bill Clinton’s U.N. Ambassador and energy secretary. He was also a congressman representing New Mexico for 14 years.