Updated at 4 p.m.: Revised to include statement from MADD.

Ethan Couch was 16 years old when he struck and killed four people while driving drunk in 2013.

Couch was spared jail time at first, but he spent the past two years in the Tarrant County jail for violating the terms of his probation and fleeing to Mexico with his mom.

The so-called "affluenza teen" is a teen no more. Just a little more than a week away from his 21st birthday, he's getting a second chance at life.

Couch, wearing a black hooded sweatshirt, walked out of the county jail around 11:30 a.m. Monday and got into a black Tesla that drove off. He did not speak to reporters.

Couch isn't completely a free man.

He'll have a Global Positioning System monitor strapped to his ankle and a 9 p.m. curfew. A substance-abuse test patch will monitor his alcohol use. And if he drives, he'll have to use a camera-equipped ignition interlock that will keep him from driving if he's intoxicated.

It's unclear where Couch will live.

His mother, Tonya Couch, remains in jail after her arrest last week over an alleged violation of her bond conditions. She's accused of helping her son flee to Mexico and faces charges of hindering apprehension of a felon and money laundering.

Ethan Couch has been in the public eye since 2013, when he drove into a group of people and killed four of them while driving drunk on a Burleson road. Couch's blood alcohol content was three times the legal limit, authorities said.

A psychologist testified at Couch's trial that he suffered from "affluenza" because his dysfunctional relationship with his wealthy parents had destroyed any sense of personal responsibility he may have had.

Couch was eventually — and controversially — sentenced to probation but came under scrutiny in 2015 when a video appeared to show him at a party where alcohol was being served. Authorities said Couch violated the terms of his probation when he skipped a meeting with his probation officer and fled to Mexico with his mother.

His case was transferred to adult court, where a judge ordered that he be sent to jail as a condition of his probation.

While in jail, Couch got an unlikely visitor: the longtime friend Brian Jennings, one of his victims.

Tim Williams, who knew Jennings since they were teens, told The Dallas Morning News last month that he believes Couch will leave jail a different person.

In a prepared statement Monday, Couch's lawyers said their client was asking for privacy.

"From the beginning, Ethan has admitted his conduct, accepted responsibility for his actions, and felt true remorse for the terrible consequences of those actions," the statement said. "Now, nearly five years after this horrific event, Ethan does not wish to draw attention to himself and requests privacy so he may focus on successfully completing his community supervision and going forward as a law-abiding citizen."

Irving-based Mothers Against Drunk Driving called Couch's release from jail after two years "a grave injustice to the victims and their families."

"Rest assured MADD will continue to monitor this case to honor the victims of this tragedy and their families," the anti-drunken driving organization said in a prepared statement. "We will be watching because this case brought to light that there is so much more work to be done to hold drunk drivers accountable."

Staff writer Tom Steele contributed to this report.