The incident was reported around 11:30 p.m. Friday in Katy.
The Harris County deputies say a 16-year-old boy was showing a gun to his 15-year-old cousin when the gun went off and hit the teen in her upper chest area.
The 15-year-old was transported to the hospital, and is expected to survive.
There's no word on whether the 16-year-old teen, who was playing with the gun, will be charged.
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