Hunter Harrison

NEW YORK (AP) — Hunter Harrison, the president CEO of railroad giant CSX, has died, the company announced Saturday. He was 73.

CSX confirmed Harrison’s death in a statement, saying it was caused by “unexpectedly severe complications” from a recent illness. His death in Wellington, Florida, comes only a couple days after the company announced he was taking an unplanned medical leave of absence.

Born in Memphis, Tennessee, Harrison was a long-time railroad executive who made his career turning around railroads. Before joining CSX in March, Harrison was president and CEO of Canadian Pacific Railway Ltd. and the Canadian National Railway Company. He also was the head of the Illinois Central Railway in the 1990s.

He was hired by Florida-based CSX in March under shareholder pressure. But recently there had been concerns about his health. The Wall Street Journal reported in May that Harrison often worked from home and occasionally required portable oxygen.