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The incident happened in east Harris County on Muscatine Street shortly after 4 p.m.
According to investigators, the victim and his girlfriend were parking to get food at nearby Tacos el Toro #2 when an undisclosed car pulled up to the victim's driver-side door and opened fire.
The 21-year-old was shot and transported to the hospital. In a later update, investigators said he was in critical condition.
His girlfriend was not physically injured.
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Investigators said the suspect fled westbound on Muscatine Street.
They are working to confirm several eyewitness accounts before releasing a description.
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