LITCHFIELD PARK, AZ (3TV/CBS 5) - An 11-year-old boy shot and killed his grandmother before turning the gun on himself after being told to clean up after himself on Saturday in Litchfield Park, according to the Maricopa County Sheriff's Office.
Doyle Hebert and his wife Yvonne Woodard had asked the boy throughout the day to clean his room since he wouldn't do it in the area of Litchfield and Indian School roads, Sgt. Joaquin Enriquez with MCSO said.
While the couple was watching television, the boy came up behind them and shot Woodard in the back of the head just after 5 p.m., according to Enriquez.
Hebert said he ran after his grandson but then returned to his 65-year-old wife where he tried to help her.
That's when he heard another gunshot and saw his grandson take a few steps and then fall to the ground, according to Enriquez.
"We stood outside and we prayed," neighbor Danny Dillon said. "It's just hard. You can't get your mind around it, you just can't."
The gun belonged to Hebert and the couple had full custody of the boy, Enriquez said.
MCSO said there were no previous signs that the boy would harm somebody or himself.
"Nice family. I knew the kid. I mean, he would ride his bicycle around, play around the neighborhood," another neighbor, Walter Venerable, said.
Neighbors said the family was always friendly and waved as they were coming and going.
"You have that neighborly connection but your heart just wishes that you had more and you could've done more, you could've seen something or said something," Dillon said.
On Monday, the Litchfield Elementary School District released a statement confirming the the boy was a student as Western Sky Middle School.
"Our hearts are with the Hebert family and their loved ones as they endure this unimaginable pain," the statement reads.
District spokeswoman Shelly Hornback said psychologists were available on campus for "our students and staff who are processing this devastating news."
[READ: Entire statement]
An investigation is underway.