Tarrant County sheriff's spokesman David McClelland says Ethan Couch was released Monday from the county jail near Dallas after serving nearly two years for a revoked probation.
Couch was 16 in June 2013 when he struck and killed four pedestrians. A psychologist at his manslaughter trial blamed his irresponsibility on family wealth, dubbing it "affluenza." A juvenile court sentenced him to 10 years of probation.
Couch's probation was revoked in 2016 after he attended a party where alcohol was served.
His mother, Tonya Couch, awaits trial on charges of hindering apprehension of a felon and money laundering after she fled to Mexico with her son in 2015.