Now Playing: Wisconsin community holds vigil for missing girl Jayme Closs

Now Playing: 15 injured when flight to Buenos Aires hits violent turbulence

Now Playing: Prince Harry kicks off Invictus Games by scaling Sydney Harbor Bridge

Now Playing: 911 transcript released in case of missing Wisconsin 13-year-old girl

Now Playing: Small plane makes emergency landing on California interstate

Now Playing: Mega Millions soars to $1 billion for first time in game’s history

Now Playing: Deadline to buy Mega Millions tickets varies by state

Now Playing: Missing pregnant postal worker likely victim of foul play: Authorities

Now Playing: Boy accused of assault in NYC store video: ‘I felt humiliated’

Now Playing: Authorities reopen floodgates to relieve pressure at Texas dam

Now Playing: Russian woman arrested in alleged plot to meddle with midterms

Now Playing: Mexican police clash with migrant caravan near Guatemala border

Now Playing: Nevada residents drive to the California border in hopes to hit the jackpot

Now Playing: ‘GMA’ Hot List: Black child accused in ‘Cornerstore Caroline’ video speaks out

Now Playing: Anti-hazing law named after Penn State fraternity pledge goes into effect

Now Playing: Boy ‘humiliated’ after woman falsely accuses him of sexual assault

Now Playing: Veteran fights to keep ’emotional support’ tigers

Now Playing: Why do Mega Million jackpot prizes get so big?

Now Playing: Mega Millions jackpot hits $1 billion

Now Playing: Adults are innocently, but hilariously, confusing the laughing and crying emojis