The San Mateo County Coroner's Office scheduled a morning news conference to announce the cause and manner of 16-year-old Ye Meng Yuan's death.
She and her middle school classmate, 16-year-old Wang Linjia, died in the July 6 crash at San Francisco International Airport.
The other victim killed, 15-year-old Liu Yipeng, died at a hospital July 12. Dozens of others were injured.
Police and fire officials confirmed last week that Ye Meng Yuan was hit by a firetruck racing to extinguish the blazing Boeing 777.
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Rescuers discovered her body in the tire track when the truck moved while battling the flames, according to police.
Meanwhile, the probe into the crash itself continues.
Investigators have said the plane came in too low and too slow, clipping its landing gear and then its tail on a rocky seawall just short of the runway.