According to witness reports, Karla Garrufe, 21, died on Thursday morning after being gunned down by a man whose car she had bumped into from behind, said Miguel Angel Guerrero, a spokesman for prosecutors in Tijuana.
A witness said that after the two began arguing, the man pulled out a gun, shot her and drove off, he added.
The suspect has not been caught, prosecutors said.
Tijuana, which lies on the border with California, has been one of the areas worst hit by a spike in violence in Mexico that pushed murders to a record high last year.
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