Sandy Le, 26, had been in critical condition since Thursday. She and 21 other people were hurt when a car driven by Rashad Owens, 21, sped through an area closed to traffic for the 10-day festival.
Jamie West, 27, and Steven Craenmehr, 35, were pronounced dead at the scene. Six injured festival goers remain hospitalized, two in critical condition, the Austin (Texas) Statesman-American reported Monday.
Rashad was jailed on a charge of capital murder.
Le was the youngest of four children of a Vietnamese family from Pass Christian, Miss., and recently moved to Austin, her brother-in-law, Steven Gates, said.