WAUKEGAN, Ill. (NewsNation Now) — A protest is scheduled to be held Saturday, one day after a Waukegan, Illinois officer was terminated for shooting and killing a 19-year-old man and wounding a 20-year-old woman.

Police said they were investigating a vehicle on Tuesday just before midnight near Liberty and Oak streets. While they were investigating, the car fled from one of the officers. A few moments later, another officer spotted the car near Martin Luther King Jr. and South avenues.

That officer got out of his squad car and approached the vehicle. When the officer did so, police said the car reversed. The officer fired his weapon because he was “in fear of his safety,” according to police.

Both the driver and the passenger of the car were shot, according to NewsNation affiliate WGN. The driver, identified by family as Tafara Williams, 20, was transported to a hospital and is expected to recover. The passenger, identified as Marcellis Stinnette, 19, died from his injuries. The two were a couple.

Williams said she was shot first, causing her car to go into reverse — which differs from the police department’s narrative.

The officer was terminated for multiple policy and procedure violations, the department said. His name has not been released.

Saturday’s protest is set to begin at 4 p.m. at Oak and Liberty streets and is being organized by a Black Lives Matter group.

The Illinois State Police are continuing to conduct their independent investigation.  Once that investigation has been completed, it will be turned over to the Lake County Illinois State’s Attorney’s Office for review.

No firearm was recovered at the scene.

NewsNation affiliate WGN contributed to this report.