Oregon City police have identified the 9-year-girl accidentally

as Shayla May Schonneker, a fourth-grader in the Gladstone School District.

Police also identified the shooter as Joseph Wade Wolters, 32, the live-in boyfriend of Shayla's mother.

Lt. Jim Band,

spokesman, said investigators plan to search the home Monday and have not yet finished interviewing all the witnesses. He said the Clackamas County District Attorney's Office would determine whether to file charges against Wolters.

Joseph Wade Wolters, 2007

Band said Shayla was playing out in the backyard of her home near

around 5 p.m. Meanwhile, Wolters was practicing holstering and unholstering a loaded handgun, in preparation for his new job as an armed security guard with an armored transport company.

The gun accidentally discharged, shooting through the wall of the house and striking Shayla in the face, Band said. She was about 50 yards away from the house.

Shayla was rushed by helicopter ambulance to OHSU Hospital, where she died shortly after arrival.

Shayla was a student at

, which was rocked by grief Monday. Gladstone School District Superintendent Bob Stewart said the district has activated its crisis-response team and has established a safe room for both adults and students.

"Many people on our staff were highly impacted by the news because of the close relationships they establish with the students," Stewart said. "We have made counselors available for anyone who wants to talk this over."

Stewart said Shayla was a student at John Wetten since kindergarten.

Band said Wolters was arrested in 2007, after going absent without leave from the U.S. Army. However, Wolters, a decorated Iraq War veteran who already had been honorably discharged, was released as soon as the mix-up was discovered.

Wolters received about 10 medals during his three years of Army service. He currently is a member of the military reserve.

-- Rick Bella