US Representative Sheila Jackson Lee, a strong progressive voice in the Democratic Party who was outspoken on African-American and women's rights, has died, her family posted, opens new tab on X late on Friday.

Jackson Lee of Texas announced last month she had pancreatic cancer, opens new tab and was undergoing treatment. She was 74, according to U.S. media.

"The road ahead will not be easy, but I stand in faith that God will strengthen me," she said in announcing the diagnosis.

"A fierce champion of the people, she was affectionately and simply known as 'Congresswoman' by her constituents in recognition of her near-ubiquitous presence and service to their daily lives for more than 30 years," her family said in the statement.

Lee was the chairperson of the Pakistan Caucus in the US Congress. In September 2022, the Pakistan government honoured her with the Hilal-e-Pakistan for her significant role in promoting Pakistan-US relations.

Moreover, following the devastating 2022 floods in Pakistan, Lee wrote a letter to US President Joe Biden to help Pakistan. In a speech in the US House of Representatives also, she expressed concern over the flood situation in Pakistan.

She was active throughout her career in promoting legislation aimed at addressing social justice, economic inequality and public health concerns.

Jackson Lee, who represented parts of Houston, introduced a legislation in the House of Representatives to make "Juneteenth" a federal holiday commemorating the end of the legal enslavement of Black Americans.

The holiday marks the day in 1865 when a Union general informed a group of enslaved people in Texas that they had been made free two years earlier by President Abraham Lincoln's Emancipation Proclamation during the Civil War.

Texas Governor Greg Abbott, a conservative Republican, posted, on X that his wife "Cecilia and I will forever remember Congresswoman Sheila Jackson Lee.

"She was a proud Texan and a tireless advocate for the people of Houston. Her legacy of public service and dedication to Texas will live on," Abbott said.

Jackson Lee served on several House committees, including judiciary, homeland security and budget.