AMES, Iowa State investigators said Wednesday that autopsy results show a man who lead police on a chase in Ames that ended on the Iowa State campus died from a gunshot wound to the head.
More information is expected to be released soon by police.
Police said the driver of the truck, Tyler Comstock, 19, of Boone, was pronounced dead at a hospital a short time after the shooting.
The officer who fired the shots at the truck and driver was identified as Adam McPherson who is an 8-year veteran of the department.
Recordings of police radio traffic provide more detail about what was happening in the minutes before Comstock was shot and killed.
Police officers following the pickup truck onto campus were concerned about pedestrians in the area as Comstock drove the wrong-way onto a campus road.
"We know the suspect so we can probably back it off," said an officer.
As more crews reached ISU's central campus area, the chase ended near the Campanile.
"We've got shots fired, he's trying ramming us again, shots fired," reported an officer at the scene.
A short time later crews reported back to police dispatch that one person was unresponsive in the vehicle. Rescue crews were called to the scene.
"They (officers) felt threatened. We had police cars that were rammed by the suspect. We made a number of attempts to stop the suspect that were unsuccessful and I think there was a fear that other people were, you know, in danger at that point," said Ames Police spokesman Cmdr. Geoff Huff said.
Comstock was pronounced dead a short time later at the hospital.
Police said the truck Comstock was driving was reported stolen Spring-Green Lawn Care in Boone, where his dad worked. Spring-Green workers said the father and son argued over money for a pack of cigarettes before Comstock took off in the truck.
Comstock was living at the a homeless shelter. People at the shelter told KCCI that Comstock was working with his dad on the day of the chase and shooting.
"I seen him the night before. The night before he was calm," said Gerald Elliott, manager of the All for Jesus Homeless Shelter. "We'd all seen him, you know, just before he left we had all seen him and knowing he was just going to work with his dad. You know you don't expect something like that."
The case remains under investigation by Ames police, ISU police and the Iowa Division of Criminal Investigation.