-
Now Playing: Rock climber scaled Yosemite's El Captain
-
Now Playing: Amazing Toddler Showcases Rock Climbing Skills
-
Now Playing: How 'BlacKkKlansman' director, cast tackled story of black cop infiltrating the KKK
-
Now Playing: Behind the scenes with Oscars live announcer Randy Thomas
-
Now Playing: Ted Bundy on the run makes his final stop in Florida: Part 2
-
Now Playing: Serial killer Ted Bundy's murder spree instills fear in the Pacific Northwest: Part 1
-
Now Playing: How this climber made a solo journey up Yosemite's El Capitan with no gear
-
Now Playing: Questions swirl over 'Empire' star's alleged racist attack
-
Now Playing: Jussie Smollett says he concentrated on fighting back in Chicago attack
-
Now Playing: Parkland survivors, victims' parents reflect on year of progress since massacre
-
Now Playing: Cancer survivor fears anti-vax parents are putting sick kids at risk
-
Now Playing: Wire fox terrier wins best in show
-
Now Playing: The risks of using only thermography for breast cancer screenings
-
Now Playing: El Chapo found guilty on all 10 charges
-
Now Playing: Woman who killed 'Dirty John' says she channeled 'Walking Dead' during attack
-
Now Playing: Tom Brady's Super Bowl legacy and the controversies surrounding the big game
-
Now Playing: How authorities finally captured the BTK serial killer: Part 2
-
Now Playing: Woman discovers her father is notorious BTK serial killer: Part 1
-
Now Playing: In 2nd State of the Union, Trump says 'we must reject the politics of revenge'
-
Now Playing: 'Happy Days' star Henry Winkler tells the story behind the iconic shark-jumping scene