(CNN) A 25-year-old Iowa woman was driving home from work when a bullet tore through the driver's window of her vehicle and killed her, 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. One passenger, 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.

"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 in this manner," police said in a statement.

Rettinger graduated from the University of Northern Iowa in 2016 with a degree in biology. She was 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."

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