According to Jamey Newberg of TheNewbergReport.com, the Rangers have released Derrick Turnbow after the pitcher triggered a clause in his contract that allowed him to demand a release. Turnbow and the Rangers agreed that he would be able to ask for his release if he wasn't on the team by May 1st. Turnbow walked nine and allowed 11 hits in 6.1 innings in AAA, striking out one batter.
The information comes from Newberg's online newsletter.