Ethan Couch, whose trial for killing four people while driving drunk sparked widespread conversations about the privilege of being raised wealthy, was released from a Texas jail on Monday after nearly two years.

Mr. Couch, 20, became known as the “affluenza teen” after a psychologist suggested during his trial that growing up with money might have left him with psychological afflictions, too rich to tell right from wrong. He attracted further attention when he and his mother, Tonya Couch, fled to Mexico in an effort to evade possible jail time.

He served his 720-day sentence in a jail in Tarrant County, and was freed about a week before his 21st birthday.