Rated the No. 106 weak-side linebacker prospect in the nation, Miller was one of at least nine players who made official visits to Louisville over the weekend. The Cardinals also secured commitments from defensive linemen Roy Philon and Tim High.
"He's an animal," Scout.com analyst John Wallpher said. "He is driven to succeed. If you look at his film he's tremendous off the edge. He's a great pass rusher and a tremendous tackler. He's a hell of an athlete. He's got all the tools and a good frame. I think he's only going to get better. He's better moving forward than dropping back into coverage. If you want to pin your ears back he's very difficult to stop. Horace is as good a linebacker in Maryland moving forward."
Former Tennessee assistant Larry Slade got the Cardinals involved late with Miller after joining Steve Kragthorpe's staff this month and convinced the All-State prospect to visit Louisville last weekend.
"I know Horace very well and Slade made this happen," said Whallper. "If you take football away Horace is going to be much happier at Louisville."
Miller, a two-star prospect, racked up more than 130 tackles and 29 sacks as a senior to earn All-State honors. As a junior, Miller recorded 90 tackles, 25 tackles for loss, 17 sacks and forced three fumbles.
Miller led his team to a third consecutive state championship this season.
Stay tuned to InsideTheVille.com for comments from Miller later today about his decision.