The Fresno County Coroner confirms 11-year-old Rylee Munsel of Tuolumne died on April 19.
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The collision happened on the southbound lanes of Highway 99 near Clinton on April 1.
Officers say the driver of a Dodge truck was reportedly not paying attention and didn't notice that traffic had stopped.
He tried swerving to avoid cars but slammed into the back of a Toyota Corolla.
The Corolla had two adults and three children inside.
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All five were rushed to the hospital.
Investigators say the driver of the Dodge was not under in the influence of drugs or alcohol when the crash happened.