omalu left pittsburgh.o lodi, california. >> he ends up in the dust bowl of north central california, and he's working as a medical examiner there, as far removed from the nfl as anybody could be and trying to figure out how to stay in it. >> i wish i never met mike webster. cte has dragged me into the politics of science, the politics of the nfl. you can't go against the nfl. they'll squash you. i really sincerelyish it didn't cross my path of life, seriously. >> narrator: next time, frontline's investigation of the nfl's concussion crisis continues. >> they were in a very serious state of denial. >> so it was becoming almost impossible for the nfl to ignore it. >> narrator: what does it mean for the future of football? >> an 18-year-old high school athlete with chronic traumatic encephalopathy? that just shouldn't happen. >> your child could develop a brain injury as a result of playing football. >> narrator: don't miss the conclusion of "league of denial." >> go to pbs.org/frontline and watch more of fro