Now Playing: Authorities searching for motive in bar massacre

Now Playing: The victims of the California bar massacre

Now Playing: 12 people killed in massacre at southern California bar identified

Now Playing: Trump denies knowing man he named as acting attorney general

Now Playing: Police reviewing disturbing messages posts by California bar gunman

Now Playing: HBO’s ‘Westworld’ town set destroyed by fires raging in California

Now Playing: Supreme Court Justice Ruth Bader Ginsburg released from hospital

Now Playing: Major storm brings Chicago and Minneapolis first snow of the season

Now Playing: Michelle Obama details why she’ll never forgive President Trump

Now Playing: ProPublica responds to voting security concerns at the ballot box

Now Playing: Reporter’s Notebook: Robin Roberts on exclusive Michelle Obama interview

Now Playing: Mail bombing suspect Cesar Sayoc indicted on 30 counts, faces life in prison

Now Playing: 5 dead after Northern California wildfire engulfs vehicles, officials say

Now Playing: Rare bird making a splash in New York City

Now Playing: Fast-moving wildfire devastates Northern California

Now Playing: More than 500 firefighters working to stop the wildfires

Now Playing: Residents in California race to evacuate as wildfire flares up

Now Playing: Brush fire ignites in Griffith Park behind Los Angeles Zoo

Now Playing: Massive blazes raging throughout California