Thornburgh died Thursday morning at a retirement community facility outside Pittsburgh, his son David said. The cause is not yet known. He suffered a mild stroke in June 2014.

After leaving public office, Thornburgh became a go-to troubleshooter who helped CBS investigate its news practices, dissected illegalities at telecommunications company WorldCom and tried to improve the United Nations’ efficiency.

“I’ve always had an opportunity to right a vessel that was somewhat listing and taking on water,” he told The Associated Press in 1999. “I wouldn’t object to being characterized as a ‘Mr. Fix It.’ I’ve liked the day-in, day-out challenges of governance.”

U.S. Senator Pat Toomey (R-Pa.) issued the following statement regarding the death of former Pennsylvania Governor Dick Thornburgh:

“Governor Dick Thornburgh dedicated his professional life to public service. He led Pennsylvania and later, the Department of Justice successfully and with integrity. The steady nature in which he guided Pennsylvania through one of its most dangerous crises – the nuclear accident at Three Mile Island – should serve as an example for all elected officials. I extend my condolences to Governor Thornburgh’s wife, Ginny, and their entire family.”