Kevin Hickey, who spent parts of six seasons in the major leagues with the Chicago White Sox and Baltimore Orioles, has died at age 56.

The White Sox said Hickey died Wednesday at Rush University Medical Center in Chicago. He had been hospitalized for since missing the team's workout before Opening Day. A cause of death wasn't disclosed.

A lefty, Hickey pitched with the White Sox from 1981-83 and the Orioles from 1989-91. He was 9-14 with a 3.91 ERA and 17 saves in 231 relief appearances.