During training camp, he competed for a roster spot as a backup outside linebacker against Dontay Moch, Micah Johnson, Dan Skuta, and Brandon Joyner.[8] On August 31, 2012, Lamur was released as part of the Bengals' final roster cuts.[9] The next day, the Bengals signed Lamur to their practice squad.[10] On November 2, 2012, he was promoted to the active roster after the team placed Dontay Moch on the season-ending reserve non-football injury list.[9] Head coach Marvin Lewis named Lamur the fifth outside linebacker on the depth chart, behind Manny Lawson, Vontaze Burfict, Dan Skuta, and Vincent Rey.[11]