Last week the agency said the detective died after a “critical incident.”
The Scottsdale Police Department has since announced that So and other detectives in the agency's Special Assignment Unit had completed a search warrant and arrest operation. While they were unloading equipment, police said So was moving a bag from a vehicle when a rifle from the bag fell to the ground and discharged. So was mortally wounded, AZ Central reports.
Police said fellow detectives immediately rendered aid, but So died at a hospital.
So was a nine-year Scottsdale police department veteran. He was with the Special Assignments Unit.
He is survived by his wife and three children.