A school teacher from Riesel, Texas, was arrested and charged with murder Monday after she fatally shot her teen son in her car.

The accused, identified as 39-year-old Sarah Hunt, was driving her 17-year-old son, Garrett Hunt, to his school when she shot him multiple times.

Police arrived at the scene after receiving information that an individual was found unresponsive in a stalled vehicle. They found the teen in the front passenger seat with multiple gunshot wounds. He was pronounced dead at the scene.

The teen's mother was taken into custody a short while later after she was found walking back to Riesel, ABC-affiliated television station KXXV reported.

She was charged and booked into McLennan County Jail. An investigation into the incident was ongoing and the motive behind the crime was not known. The number of gunshot wounds the victim had suffered was not known.

"At this point we don't have a motive, we don't know what happened, we don't know what led up to this. It's a big mystery, and that's what we're trying to determine," McLennan County Sheriff Parnell McNamara told Waco Tribune-Herald.

"She's been interviewed practically all day. We're trying to get to the bottom of this," McNamara said, adding that the woman did not have a criminal history.

The teen's body has been sent for an autopsy.

"It's just a very sad, tragic situation. I don't know how else to describe it. We're going to be working overtime trying to sort this one out," McNamara added.

Sarah and her son moved to Riesel only recently but they had several family members living there. She was a teacher at Lake Air Montessori Magnet School in Waco.

Waco Independent School District spokesman Joshua Wucher said the accused will be placed on administrative leave and will be terminated if she doesn't voluntarily resign. They were looking to bring in a substitute teacher to replace Sarah.

"This is a terrible tragedy, and our prayers and thoughts are with her and her family," Wucher told Waco Tribune-Herald, adding that Sarah had joined the school district this academic year.

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