DA mulls vacating Borggreen plea deal following Robinson murder conviction By KEVIN LIMITI • Special to www.AllOTSEGO.com COOPERSTOWN — Now that the trial of Dylan Robinson has ended in conviction, Otsego County District Attorney John Muehl said he is considering restarting the process against Robinson’s accomplice, Alexander Borggreen, for refusing to testify against Robinson despite making a plea deal. Muehl said he was satisfied with the conviction, which the jury returned Wednesday, June 23, although he said he was surprised…