Former Sen. Adlai Stevenson III, who spent 11 years representing Illinois, died on Monday in his Chicago home Monday at age 90, a report said.

His son confirmed his death to The Chicago Sun-Times and said dementia was the cause of death.

“He just faded away,” Adlai Stevenson IV told the newspaper.

Stevenson, a member of a dynastic family in Illinois politics, spent 11 years in the Senate and unsuccessfully ran for governor of his home state twice.

The former senator was the son of former Gov. Adlai Stevenson II and great grandson of former Vice President Adlai Stevenson.

According to legend, Stevenson asked former Chicago Mayor Richard Daley for his advice during a Senate run.

“My advice to you is don’t change your name,” Daley allegedly said.

Nancy Stevenson, his wife of 67 years, told The Chicago Tribune he remained a family man even when serving in Washington.

“When he was in the Senate, he didn’t go to a lot of fancy dinners,” Nancy Stevenson told the newspaper.

“He came home to dinner with the family. That was his first and constant concern, the family.”

Stevenson III was born in Chicago in 1930, graduated Harvard College and Harvard Law School and served in the Marines during the Korean War.

He won his first election in politics in 1964 as a state lawmaker, then later spent four years as state treasurer before serving a stint in the US House of Representatives.

He won his first term in the Senate in a special election in 1970 against Republican Ralph Tyler Smith, who’d been appointed to the vacant seat, the Tribune said. He served in that post until 1981, when he stepped down after not seeking reelection.

Stevenson followed in his father’s footsteps and ran twice for governor but fell short both times, in 1982 – the closest gubernatorial race in the state’s history – and in 1986. He lost the ‘82 race by less than 1 percentage point, according to the Tribune.

David Axelrod, a CNN commentator and former top aide to President Barack Obama, called Stevenson “rumpled and professorial,” adding the former senator was often misread.

“He had a spine of steel and kowtowed to no one-not the Chicago machine donors, interest groups … or even voters,” Axelrod tweeted on Tuesday.

“Just said and did what he thought was right.”

Gov. JB Pritzker said a statement that Stevenson’s “pursuits were anchored in a passion for democracy.

“Whether in elected office, in the Marines, or in nonprofit work, Adlai Stevenson III lived each day of his 90 years as an example of public service,” Pritzker said. “His commitment to global exchange is as evident here in Illinois as it is abroad – it is, to say the least, a rare individual who earns both the Illinois Order of Lincoln and the Japanese Emperor’s Order of the Sacred Treasure in one lifetime.”