Detectives said Sanchez struck the van and four other vehicles while traveling in the wrong direction for 2.7 miles, according to the San Antonio Express-News.
Hernandez and 9 other people were taken to local hospitals, the newspaper reported.
Hernandez, who had muscular dystrophy, a hereditary disease that leads to weakening of the muscles, died at University Hospital, Lopez told The AJC. According to a GoFundMe fundraising page, Hernandez suffered internal bleeding in his brain.
His family created the GoFundMe page because they need help to bury him.
Mayra Hernandez, the teen’s older sister, said she and her 2-year-old son sustained cuts and burns in the crash. Her mother, father and cousin suffered broken bones, she said.
“There's so much anger ... for the person that came and hit us,” Hernandez said.
Sanchez “exhibited signs of intoxication, was evaluated by DWI and subsequently arrested for three counts of intoxication assault,” Lopez said.
He was being held at the Bexar County Adult Detention Center in San Antonio in lieu of $250,000 bond, the Bexar sheriff’s office said.