Now Playing: Police: Suspected arsonist behind Holy Fire arrested
Now Playing: Residents warned as Holy Fire threatens communication towers
Now Playing: ‘GMA’ Hot List: Teen pushed from bridge feels ‘happy to be OK’
Now Playing: NFL players take a knee, raise fists during national anthem
Now Playing: Justin Verlander reveals how Kate Upton saved him
Now Playing: Chainsmokers perform new single ‘Side Effects’ live on ‘GMA’
Now Playing: Jennifer Aniston’s workout secrets revealed
Now Playing: Chainsmokers rock Central Park with ‘All We Know’
Now Playing: Chainsmokers sing ‘Paris’ live in Central Park
Now Playing: Save big on refurbished electronics this school year
Now Playing: Chainsmokers perform ‘Somebody’ featuring Drew Love
Now Playing: Chainsmokers on performing with J-Lo, Las Vegas residency
Now Playing: Chainsmokers rock Central Park with ‘Sick Boy’
Now Playing: Are the new guidelines on salt intake too extreme?
Now Playing: James Bond producers say Idris Elba could be the next 007
Now Playing: Teacher discovers tooth from extinct mega-shark
Now Playing: ‘I’m a clean … white girl,’ DUI suspect tells cops
Now Playing: Teen pushed off bridge thinks she ‘fainted midair’
Now Playing: Casey Affleck breaks silence on sexual harassment allegations
Now Playing: Sikh man attacked: Police chief helps son’s arrest
