"With incredible grief for our loss yet deep gratitude for the life she shared with us, we announce the passing of United States Representative Sheila Jackson Lee of the 18th Congressional District of Texas," her family said in a statement.
Known by her constituents as simply, "Congresswoman," Jackson Lee served the public for more than 30 years.
"A local, national, and international humanitarian, she was acknowledged worldwide for her courageous fights for racial justice, criminal justice, and human rights, with a special emphasis on women and children," a statement from her family said.
Last month, Jackson Lee announced she was fighting pancreatic cancer. In a statement, Jackson Lee said she was undergoing treatment to battle the disease "that impacts tens of thousands of Americans every year."