Former U.S. Sen. Jon Kyl, a longtime Arizona Republican who spent more than a quarter-century in Congress and became one of the Senate GOP’s top leaders, has died at age 84.
Kyl’s family announced his death Thursday, saying he died from complications related to a neurological disease.
“Our husband, father, grandfather, son, and brother, Jon Kyl, has passed away at the age of 84 due to complications from a neurological disease,” the family said in a statement released Sept. 17.
His family described public service as one of the defining parts of his life and said Kyl viewed representing Arizona as both a privilege and a responsibility.
“We know that Jon belonged to all of Arizona, a state he loved and explored with vigor, curiosity, and wonder,” the family said.
Read the full statement from Jon Kyl’s family
Kyl had publicly disclosed in late 2025 that he had been diagnosed with dementia and would be withdrawing from public life.
His death closes a political career that stretched across more than three decades and included service in both chambers of Congress.
Kyl was first elected to the U.S. House in 1986 and represented Arizona there from 1987 through 1995.
He then won election to the U.S. Senate in 1994 and served three terms, from 1995 until his retirement in January 2013.
During his Senate career, Kyl rose into Republican leadership.
He served as chairman of the Senate Republican Policy Committee and later as Republican whip, the party’s second-ranking leadership position in the chamber.
The Senate Historical Office lists Kyl as Republican whip from 2008 through 2013. (senate.gov)
His work was often less flashy than that of some of his Senate colleagues, but he became known for focusing heavily on policy details, particularly national security, taxation and water.
One of his most lasting areas of influence was Arizona water policy.
Kyl spent years working on Western water rights, tribal settlements and Colorado River issues — subjects that remain critical to Arizona today.
The Associated Press noted that Kyl played a major role in water agreements involving tribal communities, including the Gila River Indian Community, and helped shape broader water policy in the state and region. (apnews.com)
That legacy remains visible at Arizona State University.
ASU’s Kyl Center for Water Policy is named for the former senator and continues to research water supplies, conservation, tribal water rights and long-term planning across Arizona and the West. (asu.edu)
Kyl also returned unexpectedly to the Senate years after his retirement.
Following the death of Sen. John McCain in August 2018, then-Arizona Gov. Doug Ducey appointed Kyl to temporarily fill McCain’s vacant seat.
Kyl took the oath of office on Sept. 5, 2018, according to official Senate records. (senate.gov)
The appointment reunited two figures who had represented Arizona together in the Senate for many years.
Kyl served through the end of 2018 before resigning on Dec. 31, allowing another senator to begin the new congressional term.
In his resignation letter, Kyl said it had been “an honor and a privilege” to return to Washington and serve Arizona following McCain’s death. (congress.gov)
Between his Senate terms, Kyl remained deeply involved in law and public policy.
He worked in private legal practice and took on several prominent Washington roles.
Among the most notable was his work helping guide Brett Kavanaugh through the Senate confirmation process after President Donald Trump nominated Kavanaugh to the Supreme Court in 2018.
Kyl later returned to the Senate himself while the confirmation process was still unfolding. (apnews.com)
His public career also included work on defense issues.
In 2017, Kyl was appointed to the congressionally created Commission on the National Defense Strategy for the United States, which reviewed long-term military priorities and threats facing the country. (armed-services.senate.gov)
Kyl was born April 25, 1942, in Oakland, Nebraska.
He later attended the University of Arizona, earning his undergraduate degree in 1964 and his law degree in 1966.
After law school, he moved to Phoenix and practiced law for two decades before entering Congress. (senate.gov)
Kyl and his wife, Caryll, were married for more than 50 years.
The couple met while Kyl was in college, and Caryll worked as a nurse while he attended law school.
They had two children, Kristine and John, and four grandchildren.
Former Arizona Gov. Doug Ducey was among those paying tribute Thursday.
“Jon Kyl gave Arizona nearly three decades of principled, thoughtful leadership — and he gave me something just as valuable: his mentorship and friendship,” Ducey wrote on X.
See Doug Ducey’s tribute to Jon Kyl
Kyl was known in Washington as a policy-focused lawmaker who often worked behind the scenes rather than seeking the spotlight.
The Associated Press described him as a legislative “workhorse,” particularly on the complicated water agreements that continue to shape Arizona’s future. (apnews.com)
His family said memorial arrangements will be announced later.
For Arizona, Kyl’s legacy stretches beyond his election victories or leadership titles.
His name remains attached to debates over water, national security and public policy that continue years after he left elected office.
And after serving Arizona in Congress for nearly three decades — including one final return following McCain’s death — Kyl remained one of the state’s most experienced public figures well into retirement.
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