Now Playing: Chris Tomlin performs ‘Good Good Father’ and ‘O Come All Ye Faithful’ mashup

Now Playing: Radio station drops Christmas classic ‘Baby, It’s Cold Outside’

Now Playing: Celebrating the holidays in NYC, the unofficial Christmas capital of the world

Now Playing: Man accused of killing officer taken into custody

Now Playing: Man accused of killing Northern California police officer taken into custody

Now Playing: Trump threatens to close border over wall funding

Now Playing: El Paso overwhelmed with migrants

Now Playing: DHS secretary visits El Paso after death of child

Now Playing: 3 kids die in house fire; mom, 2 siblings escape

Now Playing: Manhunt for suspect who allegedly shot cop continues

Now Playing: Parents of missing woman win custody of her daughter

Now Playing: NYC night sky glows blue

Now Playing: College football super fans live on billboard

Now Playing: Times Square prepares for New Year’s Eve

Now Playing: Storms thrash states across US

Now Playing: Police fatally shoot woman they believed had been involved in shooting

Now Playing: Police officer dies weeks after he was shot in the face in the line of duty

Now Playing: Winning Powerball ticket sold at NYC gas station

Now Playing: Temporary Instagram horizontal scroll feed sparks Insta-hate

Now Playing: News headlines today: Dec. 28, 2018