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The incident happened in the 7500 block of Homestead Road just after 6 p.m.
When police arrived, the man was found in the driver's seat of a car, suffering from a gunshot wound.
Officers attempted to render aid to the man and transported him to Lyndon B. Johnson Hospital, where he was pronounced dead, according to police.
Officials say there was a gun found on the floor of the vehicle.
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Investigators are speaking with a man who they say was in the car at the time of the shooting.
That witness reportedly told police that the 33-year-old was putting the gun away in the console or glove box when it went off, striking him, officials say.
Officials said they would be looking into camera footage from a nearby business as the investigation continues.
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