Shots then started hitting the lower part of the building, Ihlenfeld said, coming within 2 inches of the officers. It was a bright, sunny afternoon, but part of the building was in shadow, so he might have seen them.
"It's just impossible for us to know what was going on in his mind when those two men walked over to the windows," Ihlenfeld said.
A 911 call went out one minute after Piccard began firing 23 rounds from an assault rifle and three more rounds from a 9-mm handgun.
Officers confronted Piccard within three minutes, and a Wheeling police officer shot Piccard several times. Ihlenfeld said the autopsy report showed gunshot wounds to the arm, heart and lungs.
The Wheeling officer has had extensive counseling and remains on administrative duty, as a formality, until all findings have been presented to a prosecutor for review, said Police Chief Shawn Schwertfeger.
Piccard left the Wheeling police force in 2000 after serving more than 10 years. Schwertfeger said he doesn't think the officer who shot Piccard knew him.
Investigators found that Piccard had legally purchased a tactical assault rifle, two extra clips and six boxes of ammunition from a federally approved weapons dealer in the region before the shooting, and that dealer complied with all relevant laws, Ihlenfeld said.
Piccard bought the Glock handgun two years earlier. Ihlenfeld said that deal also was a legal transaction.
After the shooting, authorities searched Piccard's vehicle and home, evacuating the neighborhood after reading a Latin phrase that loosely translated to "Abandon hope, all ye who enter here" on the door. They tore off a back wall of Piccard's house during the search but found only a World War II souvenir hand grenade.
"It was of no threat whatsoever," Ihlenfeld said.