 In February 1988, sheriff's deputies discovered another escape attempt when, after moving McNair to another cell, they found two cinder blocks partially chiseled out from the cell in which he was being held.In October 1992, McNair escaped with two other prisoners from the North Dakota State Penitentiary in Bismarck, North Dakota, by crawling through a ventilation duct.One of the prisoners who escaped with McNair was apprehended within hours, and the other within days.