HOUSTON - Harris County authorities have opened an investigation after a teen died in a hospital on Friday.

Harris County: Teen dead from possible carbon monoxide poisoning

What we know:

According to officials, including Sheriff Ed Gonzalez , the situation started at the family's home.

The teen's mother came home from work at about 3 a.m. The girl got in the car and talked with her mother, then they fell asleep in the vehicle as it was running.

Sheriff Gonzalez says the two used to sleep in the car when they were homeless, and they continued the habit at the home they recently moved into.

Officials say the mother woke up at about 5 a.m. and eventually realized that her daughter was unresponsive.

The family was driving the teen to a hospital, but they were told to meet first resp

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