The accident took place at about 11.15pm in Northwest Austin.
Peggy Howard, 60, was declared dead just before midnight, the channel adds. She was a kindergarten teacher at Steiner Ranch Elementary School.
Worried about late-night driving, she had earlier dropped off son Cale Howard, 18, at the movies with a friend and had just picked him up.
Howard, a senior at Vandegrift High School, later died at Round Rock Medical Center several hours after the accident, Four Points News reports.
The deadly accident involved three vehicles.
Nicholas Michael Justin Wyzycowski, 21, drove a Chevrolet Avalanche when he rear-ended the Toyota Prius with Peggy and Cale Howard inside, the channel reports. An official said both cars moved into oncoming traffic, hitting a nearby Toyota Camry.
Witnesses at the scene told police the person driving the Avalanche fled from the scene without checking on the other victims, KXAN reports. He is described as only wearing a towel at the time of the accident.
Wyzykowski, witnesses added, was reportedly driving between 80 and 100 miles per hour. He reportedly was 'uncooperative, indifferent and cocky' with the investigating officer and refused to take a sobriety test, KXAN reports.
Wyzykowski's blood alcohol content (BAC), taken for medical purposes, was 0.27% -- more than three times the legal limit in Texas. He faces 19 felony charges, including 2 counts of intoxication manslaughter.
Three female passengers in the Toyota Camry had broken bones, statesman.com reports. One woman had a broken neck and another had a broken back.
Howard's friend in the Prius was sitting in the backseat and survived the crash, but had a broken femur, Four Points News reports.
The accident has left friends of the victims stunned.
Jim Freid and wife April, whose daughters went to school with Cale Howard, pulled up Wyzykowski's Twitter page on Saturday. Wyzykowski's account has since been removed, but Freid saved the posts.
Eight hours before the crash, Wyzykowski allegedly tweeted 'If drinking before 5 is wrong, I don't want to be right.' Another tweet, posted around 9pm, said 'Swangin.'
'Devastation, just absolute sadness,' Steiner Ranch Principal Susan Fambrough told KVUE. 'Because how do you explain to a 5-year-old that their teacher is gone?'
In a letter published online, Fambrough said the school has 'a plan in place' for students when they return to school on January 6.
Counselors will also available for all Vandegrift High School students needing support, principal Charlie Little wrote in a separate letter published on Sunday. A student support event was held on Sunday at 2pm, as well.
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Source: Daily Mail (Szathmary, 12/29)
