WATERLOO, Iowa (AP) — Iowa investigators are working to determine who fatally shot a woman while she was driving in April. The Waterloo-Cedar Falls Courier reports no arrests have been made yet in the April 28 death of Micalla Rettinger. She was a former softball player at the University of Northern Iowa who was driving home from work at a bar with two passengers when the shooting happened.

Rettinger died and one passenger was hurt in the shooting that happened in a remote area between Waterloo and Cedar Falls on Highway 218. Police Maj. Joe Leibold says the bullet and other evidence was recently sent to a Bureau of Alcohol, Tobacco and Firearms lab for additional testing.

Rettinger was from Lenexa, Kansas. She had been living in Waterloo since graduating in 2016 from college.