Now Playing: Investigation grows in death of beloved civil rights activist

Now Playing: New survey shows over 85% of flight attendants have dealt with unruly passengers

Now Playing: How companies are dealing with getting employees back into office

Now Playing: What are the odds Simone Biles will compete in beams and floor?

Now Playing: New questions for former President Donald Trump around taxes and election

Now Playing: Over 100 people were trapped in cars after massive mudslides in Colorado

Now Playing: CDC is out with new data showing how much more contagious delta variant is

Now Playing: CDC issues new report with 'troubling' finding behind new mask guidance

Now Playing: Why heterosexual women are in last place of the orgasm race

Now Playing: How can someone experiencing domestic violence get help?

Now Playing: Amid surge in gun incidents across US, heartbreaking stories of domestic violence

Now Playing: ABC News Live Prime: Friday, July 30, 2021

Now Playing: Florida COVID ward nurse: ‘We’re back to where we were in December’

Now Playing: By the Numbers: Pandemic learning loss

Now Playing: The Rundown: Top headlines today: July 30, 2021

Now Playing: ‘Super-spreaders of digital disinformation’ hindering COVID vaccine efforts

Now Playing: Rescued river otter pup gets care at Oregon Zoo

Now Playing: ICU nurse describes toll of working amid pandemic

Now Playing: Alligator found in Texas home hot tub

Now Playing: America’s oldest working nurse retires at 96