Now Playing: Meet the mailman who delivered ‘good news’ during World War II

Now Playing: Is laser eye surgery riskier than people think?

Now Playing: Blind reverend regains sight after living 14 years in the dark

Now Playing: New injury warning for motorized scooter users

Now Playing: Missing 3-year-old North Carolina boy found alive

Now Playing: Off-duty officer killed by fellow cop in Russian roulette-style shooting

Now Playing: Roger Stone out on $250,000 bond with travel restricted by judge

Now Playing: Town mourns student killed in train collision with school bus

Now Playing: Nearly 300 people feared dead after Brazilian dam collapses

Now Playing: Brutally-cold temperatures sweep across parts of the country

Now Playing: Trump warns another shutdown could happen

Now Playing: Shortage of air traffic controllers leads to travel stoppage

Now Playing: Hospital honors 22-year-old skier killed in New Mexico avalanche

Now Playing: Brooklyn truck driver collects $298M Powerball jackpot winnings

Now Playing: Small plane carrying tourists collides with helicopter in Italian Alps

Now Playing: Parents open up about Utah student killed by man she had dated

Now Playing: Urgent manhunt for suspect sought in 4 Georgia murders

Now Playing: Bodycam shows parent firing at officer at Oregon school

Now Playing: Arctic blast slams Midwest and prepares to hit Northeast

Now Playing: 3-year-old found after more than 2 nights alone in woods