On Wednesday, a judge sentenced 54-year-old Anthony Mobley to 3 to 23 months in prison and four years probation.
Mobley pleaded guilty earlier this year in the theft of the $10,000, diamond-encrusted World Series ring in September, 2009.
Authorities say a Phillies marketing executive left the ring in a stadium washroom then discovered it was missing when he went back for it about a half-hour later.
Investigators say surveillance footage led police to Mobley, who took officers to where he'd stashed the ring in a supply closet.
Assistant District Attorney Anthony Nardozzi says the ring had been wedged between the ceiling and a wall.
Mobley's attorney previously said his client is a good man who made a poor decision.
Mobley spent decades in prison for a 1974 gang-related slaying. The judge says he had done well after his 2001 release, until the theft last year.