The Twins released Jackson on Thursday, Brandon Warne of Access Twins reports.
Jackson cleared waivers and was sent outright to Triple-A St. Paul on Sunday, but rather than keeping him on the minor-league staff, the team will now cut ties with the 36-year-old reliever. In 26.1 innings with Minnesota this season, he posted a 7.52 ERA and 1.41 WHIP alongside a 29:9 K:BB. He'll now attempt to latch on with another club -- most likely on a minor-league deal.