Now Playing: News headlines today: Feb. 13, 2019

Now Playing: ICU nurse delivers warning to others as her own dad is treated in her COVID-19 unit

Now Playing: New storm system to develop in Central US

Now Playing: Millions of Americans prepare for Thanksgiving travel

Now Playing: Oh, deer! Police rescue buck tangled in soccer net

Now Playing: Puppy saved from alligator

Now Playing: Travel during the pandemic

Now Playing: Remembering Pat Quinn

Now Playing: Man jumps into water, saves dog from alligator

Now Playing: Surgeon general discusses White House holiday party, vaccines

Now Playing: 3rd drug maker announces 'highly effective' vaccine

Now Playing: Pennsylvania judge tosses Trump campaign lawsuit

Now Playing: COVID-19 warnings ahead of Thanksgiving as antibody treatment shows promise

Now Playing: New Jersey governor talks latest restrictions, message for residents

Now Playing: Teen charged in connection with Wisconsin mall shooting

Now Playing: Sonic Drive-In shooting kills 2, suspect arrested

Now Playing: Try this zesty dry spice rub for your Thanksgiving turkey

Now Playing: Wishing Miley Cyrus a happy 28th birthday!

Now Playing: Rain and snow makes its way across the Midwest

Now Playing: Couple celebrates 51st wedding anniversary while fighting COVID-19