Now Playing: 911 Call: 'Someone Just Stole My Tow Truck'

Now Playing: Dear Princess Kate: Advice from moms of 3

Now Playing: Latest details on suspect in deadly van attack

Now Playing: President George H.W. Bush hospitalized days after wife's funeral

Now Playing: 10 dead after van hits pedestrians in Toronto

Now Playing: Inside the capture of Waffle House shooting suspect

Now Playing: Secretary of state nominee nabs key vote for confirmation

Now Playing: 5 self-defense moves everyone should know

Now Playing: Man at center of Facebook data scandal defends role in controversy

Now Playing: Trump tweetstorm takes on North Korea, Cohen legal issues

Now Playing: Fellow porn actress backs Stormy Daniels' claim of threat

Now Playing: Princess Kate gives birth to boy

Now Playing: Princess Kate delivers a boy: What to expect next

Now Playing: Ginger Zee opens up about her children's book 'Chasing Helicity'

Now Playing: David Archuleta breaks down the best moments of last night's 'American Idol'

Now Playing: Chris Evans opens up about 'Avengers: Infinity War'

Now Playing: Pitcher in critical condition after brain hemorrhage

Now Playing: Step up your festival beauty game with these new trends

Now Playing: Prince William, Princess Kate welcome baby boy

Now Playing: Brett Young performs 'Like I Loved You'