FREDERICK, Colo. (CBS4) – Investigators in Weld County are trying to determine exactly how a 3-year-old boy was shot in the head Monday morning.

The boy died at 11:15 a.m. at Exempla Good Samaritan Medical Center in Lafayette after his mother called police when she found him lying on the ground and not breathing at a home in Frederick.

Frederick Police Chief Gary Barbour said the boy died from a gunshot wound to the head from a semi-automatic handgun.

It happened in the middle of his parent’s bedroom just after 9 a.m.

When police arrived at the home a handgun was found near the child’s head and a bullet was found lying on the bed.

Police said when the mother found her son in her room she didn’t seem to know what happened.

“The mom reported it to the communications center as she found her child on the floor with a bloody head wound; he was unconscious,” Barbour said. “She believed that he had fallen and struck his head on the bedside table.”

The Colorado Bureau of Investigation is trying to determine who fired the gun. They said it’s possible the boy could have fired the gun himself. They’re also trying to determine if that handgun was locked up and whether or not anyone will be facing charges in a crime.

Police won’t release names until more family members can be notified.