Now Playing: Volunteer Paramedics Risk Their Lives In Mexico

Now Playing: Girl Gang Violence Caught on Tape

Now Playing: 2 transgender women killed days apart in Charlotte

Now Playing: Fourth-grade trans activist testifies before Texas lawmakers

Now Playing: ABC News Live Update: 8 dead after mass shooting at FedEx facility in Indianapolis

Now Playing: Indianapolis official comments on latest mass shooting

Now Playing: A mass shooting at a FedEx facility in Indianapolis leaves 8 people dead

Now Playing: FBI assisting Indianapolis police in investigation of mass shooting at FedEx facility

Now Playing: Former officer Kim Potter charged with 2nd-degree manslaughter

Now Playing: Derek Chauvin declines to testify at his trial

Now Playing: Closing arguments set for Monday in Derek Chauvin’s trial

Now Playing: Rebecca Simic on supporting kids of imprisoned parents: ‘They’ve done nothing wrong’

Now Playing: Florida’s Brevard Zoo introduces baby two-toed sloth

Now Playing: 15,000 cereal boxes toppled like dominoes to honor school employee

Now Playing: What to expect in closing arguments in Derek Chauvin trial

Now Playing: Derek Chauvin refuses to testify as defense rests its case

Now Playing: Delish editorial director Joanna Saltz shares her take on 2 American food favorites

Now Playing: April snow hitting Northeast while flooding continues along Gulf Coast

Now Playing: Officer who killed Daunte Wright makes 1st court appearance

Now Playing: At least 8 dead, several wounded in Indianapolis FedEx shooting