A Missouri teen was shot dead and left inside her home for hours before her mother returned and discovered her body, leading to criminal charges against three juveniles, authorities said.

Deputies responded Saturday afternoon to a home on Tower Road near Hillsboro, about 45 minutes southwest of St. Louis, where they found 16-year-old Gabbriana Boyster with a gunshot wound to the head, according to the Jefferson County Sheriff's Office. Investigators believe she was shot Friday evening while three juveniles who knew her were inside the home.

One suspect has been charged with involuntary manslaughter, unlawful use of a weapon resulting in death, armed criminal action and abandonment of a corpse, according to the Jefferson County Juvenile Office. Two others were each charged with abandonment of a corpse and later released. Authorities have not identified the suspects because they are minors.

Boyster's mother, Candy G'Sell, was away when the shooting happened, according to the sheriff's office. She School District said grief counselors will be available for students and families following Boyster's death.

"Our hearts are with the student's family, friends, and everyone impacted by this unimaginable loss," Superintendent Dr. Jon Isaacson said in a statement obtained by KMOV. "While words cannot take away the pain of this tragedy, we want our students, staff, and families to know they are not alone. We are committed to providing support and care for everyone who is grieving during this difficult time."