(CNN) — A 25-year-old Iowa woman driving home from work was killed by a bullet that tore through the window of her car, Waterloo police said.

Micalla Rettinger was in the car with two passengers around 2:30 a.m. Sunday when she was hit in the neck, police said.

“There is nothing to indicate the victims in this case were in any way involved in any activity that would have caused them to be targeted,” Waterloo police said in a statement.

Investigators are considering the possibility that the shot was fired by a hunter, police Maj. Joe Leibold told TV station KGAN. It is not legal to hunt at that time of night, he said, but the police have heard of illegal hunting in a wooded area near where Rettinger was killed.

The young woman was driving home from her Saturday night shift at Mulligan’s, a sports bar near the University of Northern Iowa campus in Cedar Falls.

One of her passengers, Adam Kimball, 32, was injured and is being treated at the University of Iowa Hospitals in Iowa City. The other passenger was uninjured, according to police.

Rettinger graduated from the University of Northern Iowa in 2016 with a degree in biology. She had been a member of the school’s softball team.

“We are devastated to learn of the senseless death of Micalla Rettinger,” David Harris, the university’s director of athletics, said in statement. “This news is heartbreaking to our softball team, UNI Athletics and the entire campus. Our thoughts and prayers are with Micalla’s family and friends.”

After graduating from Park Hill High School in Kansas City, Missouri, Rettinger went on to become an “outstanding outfielder for the Panthers,” according to a university news release. In her junior and senior years, she earned second-team Missouri Valley All-Conference honors, the school said.

“I am devastated. KK was a pretty special kid to us,” head softball coach Ryan Jacobs said in the statement. “I can still see the smile on her face and I remember the way she always thought of other people first in a genuine way. When we had youth camps, she was the one that all of the kids on campus would be drawn to.

“This is a huge loss to our team and everyone that knew her.”

Waterloo authorities are asking for the public’s help in identifying anyone who may have been involved in “shooting or hunting (legal or illegal) in the area of the Cedar River between the Highway 218 Bridge and the Conger Avenue Bridge.”

Waterloo police said there is a $6,000 reward for any information leading to the arrest of the person who shot her.

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