Now Playing: 'The View' Exclusive: Bobby Brown Discusses Whitney Houston

Now Playing: Broadway Stars Honor Victims of the Orlando Massacre on the Tony Awards Red Carpet

Now Playing: Stars of 'Hamilton' Talk Huge Night at Tony Awards

Now Playing: 'Hamilton' Steals the Show at the Tony Awards

Now Playing: Celebrities React to Orlando Nightclub Shooting

Now Playing: 'GMA' Musical.ly Challenge Contest: Quarterfinalists' Entries Revealed!

Now Playing: Christina Grimmie Shooting Investigation Starts to Shed Light on Incident

Now Playing: Selena Gomez Pays Tribute to Slain Singer Christina Grimmie

Now Playing: Investigators Attempt to Determine Why Rising Pop Star Was Shot Dead

Now Playing: Michael Fassbender Talks 'X-Men: Apocalypse'

Now Playing: Gawker Files for Bankruptcy After Hulk Hogan Lawsuit

Now Playing: New Documentary Series Chronicles the Rise and Fall of O.J. Simpson

Now Playing: 'People's List' Brings Unprecedented Access to Your Favorite Stars

Now Playing: Daisy Ridley Sings Along With Barbra Steisand

Now Playing: 'OJ: Made in America' remembers the details of the 'Trial of the Century'

Now Playing: Louisville Says 'Goodbye' to the Greatest of All Time, Muhammad Ali

Now Playing: 'GMA' Hot List: Paul Ryan on Donald Trump and Lucky Mom Gets Epic Surprise

Now Playing: 'GMA' Summer Concert Series: Iggy Azalea Performs 'Work'

Now Playing: 'GMA' Summer Concert Series: Iggy Azalea Performs 'Fancy'

Now Playing: 'GMA' Summer Concert Series: Iggy Azalea Performs 'Team'