As woman drives away, ICE agent claims he was in fear of his life and killed her.

Here is the 110 page ICE Firearms and Use of Force Handbook
https://imlive.s3.amazonaws.com/Federal%20Government/ID255426897069329047495080324203699905714/2.2.1_Attachment%2021%20-%20ICE%20Firearms%20and%20Use%20of%20Force%20Directive%20and%20Handbook.pdf

Page 12 includes the following:

4) Deadly force is not authorized solely to prevent the escape of a fleeing suspect. Deadly force against a fleeing subject is only authorized if there is probable cause to believe that the escape of the suspect would pose an imminent danger of death or serious bodily injury to the officer or another person.

Also, Department of Homeland Security (DHS) guidance—specifically, 2014 ICE/Border Patrol use-of-force policies—

“It should be recognized that a half-ounce (200-grain) bullet is unlikely to stop a 4,000-pound moving vehicle, and if the driver … is disabled by a bullet, the vehicle will become a totally unguided threat,” it says. “Obviously, shooting at a moving vehicle can pose a risk to bystanders including other agents.”

https://www.latimes.com/nation/la-na-border-killings-20140227-story.html

Note that the ICE guy didn't begin firing his weapon until he was out of the path of the vehicle. He shot a fleeing "suspect." That's in direct contravention of ICE rules, not to mention common sense.

That’s called murder