Now Playing: Possible Serial Killer on the Loose in Virginia

Now Playing: Michelle Obama Speaks to Virginia Tech Graduates

Now Playing: Stuffed cow toy saves boy's life

Now Playing: Appeals court upholds Mississippi 'religious freedom' law

Now Playing: Heavy winds, tornadoes rip through the South

Now Playing: 'Pizzagate' perpetrator records 'goodbye' video before firing shots at DC restaurant

Now Playing: Tropical Storm Cindy slams ashore bringing heavy rain and wind to the Gulf Coast

Now Playing: Thousands turn out for Otto Warmbier's memorial service

Now Playing: What was the Cosby jury thinking?

Now Playing: Video shows fisherman's close encounter with shark

Now Playing: Massive grass fire shuts down highway in northern California

Now Playing: Teen killed by bullet when LA County deputies fired at pit bull: Sheriff's office

Now Playing: Former nurse suspected of killing up to 60 children

Now Playing: New video in Philando Castile case shows child begging mother to calm down after shooting

Now Playing: Baking in the Death Valley heat

Now Playing: 'What Would You Do?': Ashley Graham plays girlfriend meeting boyfriend's parents

Now Playing: 92-year-old grandmother's cherry vodka hits the market

Now Playing: Flint airport director: Maintenance worker saved stabbed officer's life

Now Playing: Alleged road rage triggers massive crash in California

Now Playing: Mile-long pizza breaks world record and helps feed the homeless