Miami announced on Tuesday that Turner was designated for assignment, two days after the right-hander gave up five runs in four innings in a 7-3 loss to the Reds. Lefty Brian Flynn was recalled from Triple-A New Orleans to fill the roster spot.
"It's a tough situation with Jake," Miami manager Mike Redmond said. "We gave him a lot of opportunities and a lot of time. It came down to a decision where we just ran out of time. It's unfortunate with a guy who is so young. At the same time, too, it's an opportunity for Flynn to come up and show what he can do."
The transaction is mildly surprising because of Turner's age, 23, and his upside. The 6-foot-5 right-hander was the ninth overall pick of the Tigers in the 2009 First-Year Player Draft. He was pushed through the Minor Leagues quickly, and he made his MLB debut at age 20 in 2011.
Turner was dealt to the Marlins in July 2012 as part of the Anibal Sanchez-Omar Infante deal. The trade also included Flynn and catcher Rob Brantly.
Miami has used Turner in the rotation and out of the bullpen this season, and he went 4-7 with a 5.97 ERA. In 12 starts, he was 4-5 with a 6.03 ERA. In relief, he was 0-2 with a 5.74 ERA.
Flynn had been scheduled to start for New Orleans on Tuesday, but he will be used in long relief for Miami. The club has not officially said who will fill Turner's spot on Saturday at Cincinnati. It very likely could be Brad Penny, who threw six scoreless innings at New Orleans on Monday night.
Complicating Turner's status with the Marlins is he is out of options, so he couldn't be sent to the Minors for more seasoning.
Turner's salary this season is $1 million with a $1 million option for 2015. Based on service time, he could void his contract for next season and file for arbitration.
The Marlins still could be exploring waiver trade options for Turner, who remains one of the youngest starters in the Majors.
Flynn, 24, has worked to a 7-8 record and a 4.00 ERA in 21 starts for New Orleans, and he made one relief appearance for the Marlins earlier this year.
From a personal standpoint, Flynn has been close friends with Turner since their days in Detroit.
"It was kind of tough," Flynn said. "I went to his wedding in the offseason. We've always been close. When I started out in High [Class] A, he was there rehabbing. So we've been together since back then. We've been pretty close for a while."