The body that was found in a Texas field has been identified as Camila Mendoza Olmos, a 19-year-old who had been missing since Christmas Eve, authorities confirmed Wednesday.

Authorities found the teen’s body Tuesday while searching a field approximately 100 yards from her home.

The medical examiner determined that Olmos died of a gunshot wound to the head, and ruled her death a suicide, according to the Bexar County Sheriff’s Office.

A firearm was located at the scene where the body was found, said Sheriff Javier Salazar. A firearm belonging to a relative of Mendoza Olmos’ has been missing, he said. Authorities have not yet determined if the missing firearm is a match for the one observed at the scene, he said.

Salazar said one possibility investigators were working under regarding the teen’s disappearance was the “fear of self-harm,” and that there were some “indicators of suicidal ideation” and undiagnosed signs of depression.

“From what’s being described to us, it sounds like it was a young person going through a very tough time in their life,” he said.

Mendoza Olmos grew up in Southern California and still has close family ties. She was born in Ontario and went to elementary school there.

Dashboard camera video released this week may show Mendoza Olmos right when she went missing. Investigators believe footage shows the college student walking near her home the morning she disappeared.

Mendoza Olmos was seen on surveillance video rummaging through her car Christmas Eve morning, then walking out of sight.

Her family said she left without her phone.

If you are struggling with thoughts of suicide, or worried about a friend or loved one, help is available. Call the National Suicide Prevention Lifeline at 1-800-273-8255 [TALK], or text TALK to 741-741 for free confidential emotional support 24 hours a day 7 days a week.

ABC News contributed to this report.