United States v. Medina-Almaguer, 559 F.3d 420 (6th Cir. Mar. 12, 2009) ("In the context of a conviction stemming from a guilty plea-as Medina-Almaguer's predeportation conviction did-the question is whether the court documents establish that the defendant "necessarily admitted" the elements of a predicate offense through his plea. Id. at 16; see also id. at 20-21, 26; cf. Taylor, 495 U.S. at 602. For that purpose, a sentencing court generally may consider the charging document, a written plea agreement, a plea-colloquy transcript in which the defendant confirmed the factual basis for the plea or some other "comparable judicial record," Shepard, 544 at 26, so long as they establish what the defendant "necessarily admitted," id. at 16. Otherwise, the sentencing court must stand by the fact of conviction and the definition of the offense-whether they establish the nature of the prior conviction or not. See, e.g., United States v. McGrattan, 504 F.3d 608, 615-616 (6th Cir.2007); United States v. Bernal-Aveja, 414 F.3d 625, 627-28 (6th Cir.2005).").