The man accused of killing her is an undocumented immigrant who should have been deported after being released from the county jail.
EXCLUSIVE VIDEO: Man accused in death of Kate Steinle admits to Pier 14 shooting
But he wasn't deported because of San Francisco's sanctuary city law that limits law enforcement's cooperation with immigration authorities.
The tragedy became a lightning rod during the presidential campaign and has influenced several of President Donald Trump's executive orders.
TIMELINE: How the Kate Steinle case unfolded
Watch the video to see how the conversation about immigration and sanctuary cities evolved since the shooting.
UPDATE: Jose Ines Garcia Zarate was found not guilty of murder on Thursday, Nov. 30, 2017. Click here for the full story.
Click here for full coverage on the Kate Steinle murder case.