A popular GOP senator from a major swing state has passed away.
Jon Kyl, the longtime Republican senator from Arizona who served three full terms in the Senate and returned to Congress in 2018 to fill the seat left vacant by John McCain’s death, has died at 84. Arizona Senate Republicans announced his passing and praised his record as one of the state’s most consequential public servants.
Kyl had stepped away from public life in December 2025 after announcing he had been diagnosed with dementia. His career in Washington spanned more than a quarter-century, beginning in the House in 1987 and extending through multiple Senate terms.
A Career Built on National Security and Arizona’s Water Future
Kyl, a University of Arizona graduate, first represented Arizona’s 4th Congressional District starting in 1987. After eight years in the House, he won a Senate seat in the 1994 election and served from 1995 to 2013, rising to become the Senate Republican whip, the party’s second-ranking position in the chamber.
He built a reputation as a disciplined policy expert, particularly on national defense and water rights. His work on tribal water settlements and agreements governing access to Arizona’s water supply became a lasting part of his legacy. Arizona State University named its Kyl Center for Water Policy in his honor. Journalists covering Jon Kyl’s Senate career documented his role in shaping some of the most complex water negotiations in the state’s history.
Return to Washington After John McCain’s Death
Retirement did not keep Kyl away from Capitol Hill for long. In 2018, he accepted an appointment to temporarily fill the vacancy created by the death of his longtime colleague John McCain, returning to the Senate chamber where he had already served three terms.
Arizona Senate Republicans issued a tribute that captured the breadth of his record. “Arizona has lost one of its finest statesmen,” the statement read. “Jon Kyl combined conservative conviction with an extraordinary command of policy and a deep respect for public service. He approached every issue with discipline, understood the details, and never lost sight of the people he represented.”
The statement added that Kyl “earned the respect of people across the political spectrum without compromising his principles” and that he “brought credibility, good judgment, and a determination to deliver results” to issues ranging from national security to complex water agreements.
Condolences and What Comes Next for Arizona
Arizona Senate Republicans also offered their condolences to Kyl’s family. “Denisse and I join Arizonans in mourning his passing and praying for Caryll, their children and grandchildren, and everyone who knew and loved him,” the statement said.
Kyl’s death closes a chapter in Arizona Republican politics that stretched across decades of federal policy debates. His influence on water law, defense policy, and Senate Republican leadership leaves a record that state officials say will continue to guide their work in the years ahead.
