Prosecutors asked that Couch serve 20 years in prison. His blood alcohol level was .24, three times the legal limit for an adult.
Psychologist G. Dick Miller testified for the defense that Couch suffered from "affluenza," a condition in which "his family felt that wealth bought privilege and there was no rational link between behavior and consequences," KHOU reported.
Miller said Couch's parents never punished him for his behavior, even when, in a separate incident, cops found him passed out in a car with a naked 14-year-old girl.
As part of his sentence, Couch will be sent to a private counseling center that costs $450,000, which will be paid for by his father.
Money and privilege has helped defendants avoid serious prison time for violent crimes before.
In a particularly clear example, cited by journalist Glenn Greenwald, hedge fund manager Martin Joel Erzinger served just 90 days in jail after driving the car that seriously injured a bicyclist and fled the scene of the accident in 2010.
The district attorney in the case charged Erzlinger with two misdemeanors instead of a felony, noting that "felony convictions have some pretty serious job implications for someone in Mr. Erzinger's profession."