Forensic ballistics examination may disclose which bullets killed the couple.
“We don't know how many rounds were fired by each officer. We don't know why they fired. We don't know what the suspect was doing. There's a lot we still don't know,” Nelson said.
It may be impossible to tell who fired the fatal rounds unless the state medical examiner locates bullets in their bodies.
“We try to account for every round fired,” Nelson said. “Sometimes you can't.”