WASHINGTON (AP) — R. James Woolsey, a national security expert who led the CIA for two turbulent years after his appointment by President Bill Clinton, has died. He was 84.

Woolsey, who became CIA director in early 1993, died Tuesday at his home in Washington, according to several newspapers. His wife, Conchita Sarnoff Woolsey, told the newspapers that he died from a stroke.

She told The Washington Post that his health had declined in recent years due to “Havana syndrome,” a mysterious condition that’s been reported by some U.S. diplomats and other government personnel. Symptoms that include headaches, balance problems and difficulties with thinking and sleep were first reported in Cuba in 2016 — leading to the label.