Three-year starter who was named an All-American in 2015, ranking fourth in the nation with 20.5 tackles for loss and leading Northwestern with 122 tackles. Made 105 tackles (10 for loss) with four forced fumbles and two sacks as a junior in 2016. Took over at middle linebacker midway through his redshirt freshman season in 2014 and led the team with nine tackles for loss.
Athletic and explosive linebacker with the ability to develop into a three-down defender. Quick in all his actions, displays terrific range and covers a large area on the field. Effectively uses his hands, easily redirects to ball carriers or immediately alters his angle of attack. Physical and forceful on the blitz, exploding up the field to fill gaps in run defense. Flows well laterally showing speed to the flanks, possesses a terrific head for the ball and is quick locating the action. Runs with tight ends across the field, has a quick first step to the play and lays it on the line.
Short and may struggle in coverage matchups. Gets confused in coverage on occasion. Not a secure tackler. Occasionally overpursues the action.
Walker has been a force since his freshman season and is an explosive athlete that could start on the inside of a 3-4 alignment once he completes his game.