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The victim was identified by her grandmother as 22-year-old Briana Marie Navarro. Navarro, who was reportedly six months pregnant, died at the scene.
There were also three other passengers inside the car including Navarro's 2-year-old son, according to police.
The shooting occurred near Wilcrest at Richmond around 12:30 p.m., HPD said.
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According to police, there was an altercation between the victim, her boyfriend and another group of men at a nearby convenient store moments before the shooting.
Police said they believe the suspect got away in a dark-colored car.
The Houston Police Department said the city has 103 homicide cases this year, through Monday.
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