Overview
- Kyl’s family announced on Thursday, Sept. 17, 2026, that he died at 84 from complications of a neurological disease tied to dementia.
- He disclosed the dementia diagnosis and withdrew from public life in December 2025, telling supporters he would step back as the condition progressed.
- Kyl served in the U.S. House from 1987 to 1995 and in the Senate from 1995 to 2013, rising to Senate Republican whip from 2007 to 2013 and briefly returning by appointment in late 2018.
- His policy legacy centers on Western water law, including the 2004 Arizona tribal water settlement that secured large, long-term water allocations for the Gila River Indian Community, and on guiding high-profile judicial confirmations such as Brett Kavanaugh’s.
- Leaders across the political spectrum mourned him as a pragmatic, behind-the-scenes lawmaker, the family said memorial arrangements will be announced later and institutions in Arizona that bear his name reflected on his lasting influence.