Now Playing: Pilot in deadly plane crash had false credentials: Sheriff

Now Playing: Deadly California plane crash

Now Playing: Investigation underway behind deadly California plane crash

Now Playing: R. Kelly’s lawyer pleads not guilty on his behalf

Now Playing: Deadly tornadoes tear through the South

Now Playing: Police superintendent speaks about Smollett incident, offended by what happened

Now Playing: NTSB investigators searching for black boxes in plane carrying Amazon cargo

Now Playing: ‘Abducted in Plain Sight’ victim Jan Broberg on her kidnappings and childhood

Now Playing: Dianne Feinstein and students debate Green New Deal

Now Playing: Old precedents too often overrule new forensic science insights, judge says

Now Playing: R. Kelly pleads not guilty to sex assault charges

Now Playing: It’s Morning, America: Monday, Feb. 25, 2019

Now Playing: Dangerous tornadoes rip through the South

Now Playing: Oakland news crew robbed, security guard shot while covering teachers’ strike

Now Playing: News headlines today: Feb. 25, 2019

Now Playing: Chicago police chief speaks out on Jussie Smollett case

Now Playing: Patriots owner faces threat of arrest warrant

Now Playing: West Virginia community garden helps addicts in recovery

Now Playing: Wrongfully convicted man reaches $21M settlement

Now Playing: Attempted hijacking of flight headed to Dubai makes emergency landing in Bangladesh