Investigators from South Indiana have released new details of the deadly shooting, which involved a police officer, a motorist and a volunteer firefighter.

The incident began when Officer Zachary Holly responded to a call from a motorist who was stuck near an elementary school in Palmyra, Indiana, Harrison County Attorney Schalke said.

Justin Moore of Owensboro, Kentucky, was at the scene when Holly arrived. Then came firefighter-volunteer Jacob McClanahan. Both Holly and McClanahan tried to help drive the vehicle at the scene.

Schalke said it was then that Holly learned that the car driven by Moore had allegedly run out of petrol. They then discussed what would happen to the car, and eventually decided they were going to call a tow truck.

During the meeting, Holly asked Moore if he had a weapon in his car, to which Moore replied no. Schalke said Moore had a knife with him, and Holly asked him to return it to the car.

That’s when the meeting escalated. Schalke said Moore reached into the car and pulled out a gun, firing at Holly.

Schalke said the shot nearly flew to Holly, and he and McClanahan tried to back away. It was then that Moore made another round, fatally injuring McClanahan, Schalke said.

Holly responded with fire in response, hitting Moore, who died of his injuries at the scene.

Schalke said McClanahan’s colleague was in a nearby yard when the shots were fired. He added that the whole meeting was filmed not only on video, but also on the camera of Holly’s car and the bell camera in the door of the house nearby.

This video evidence is what Schalk said his team was examining to determine if Holly was acquitted of using lethal force.

“The videos leave no doubt as to what happened, and clearly show that the officer was justified in his actions and decisions to use lethal force,” Schalk said.

Asked about Moore’s motives, Schalke said it was unclear what prompted him during the meeting. He said while watching the video Moore was excited, but there was no indication that he was planning an ambush.

Schalke also said there was “no logical explanation” as to why Moore found himself in Harrison County, nearly 100 miles from where he came from. Investigators said the evidence showed there was no gas in the car, and an Indiana police sergeant. Kerry Hals said state police also determined that Moore was talking to neighbors who were asking for money for gas or gas before the deadly encounter.

Here is what Schalk said investigators determined what happened Monday night:

“I watched these footage from the body camera more times than I would have liked, trying to make sense of the senseless murder,” Schalk said.

Schalke said that perhaps Moore was not happy that the police showed up to help him, or that in the end he wanted to stay calm. He added that ultimately there is still no clear answer as to why Moore decided to open fire.

Hals added on Wednesday that he knows there have been many questions about the investigation from the start, but his team wanted to wait for more details before publishing more information.

He said the recent completion of the autopsy helped them get “final answers”.

Schalk expressed his condolences to the McClanahan family, adding that his “heart was breaking” for what had happened to the volunteer firefighter. He said he died doing what he was known for and it was helping others.

Holly, who has worked in the department for four years, was on temporary leave before the investigation. He received minor scratches during the incident and was examined at the hospital.