A San Antonio teenager's grandmother turned him in to police after discovering he allegedly shot his sister's boyfriend while on drugs.

Officials found the victim at around 6 a.m. Sunday with a gunshot wound in his right thigh, according to FOX 29 San Antonio. The victim, who was found in his apartment, was sent to a local hospital.

The 16-year-old was reportedly doing drugs with the victim when they got into a verbal dispute. Officials believe the teenager shot the victim and immediately fled the scene.

Police said that moments later, the assailant's grandmother brought him to a police station. While turning him in, she brought the handgun he allegedly shot the victim with.

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San Antonio Police Cruiser

The San Antonio Police Department charged the teenager with aggravated assault with a deadly weapon and unlawful possession of a firearm. (San Antonio Police Department)

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The teen was charged with aggravated assault with a deadly weapon and unlawful possession of a firearm.

The case is being investigated by San Antonio police and no other details are immediately available at this time.

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The San Antonio Police Department did not respond to Fox News Digital's request for comment.