A Texas teenager who used an "affluenza" defense in a fatal drunken-driving wreck is set to appear in court for a hearing over whether his case should be transferred to the adult system.

Eighteen-year-old Ethan Couch is due in court Friday in Fort Worth.

He could face up to 120 days in jail as part of the terms of adult probation. A ruling keeping him in the juvenile system could trigger hearings in which Couch could either go free or be sent to prison for 10 years when he turns 19.

Couch's attorney has said he won't challenge a transfer to adult court.

Authorities say Couch and his mother fled to Mexico in December, as prosecutors investigated whether he violated his probation in the 2013 wreck that killed four people.