Mother of 'Affluenza' Teen Wanted for Alleged Probation Violation Put on Missing Person's List

PHOTO: Ethan Anthony Couch is pictured in an undated photo released by the U.S. Marshals Service on Dec. 18, 2015.PlayU.S. Marshals Service
WATCH Tips Pour in Amid Search for 'Affluenza' Teen

The mother of the teenager whose drunk driving trial included a defense witness saying that he was afflicted with "affluenza" has been listed as a missing person, making her part of the investigation into the teen's probation violation, authorities said.

The U.S. Marshals issued a wanted poster Friday for Ethan Couch, who police believe has violated the conditions of his probation, and are offering a $5,000 reward in exchange for the 18-year-old's whereabouts.

A spokesperson at the Tarrant County, Texas, District Attorney's Office said today that the teen's mother, Tanya Couch, was put on the missing person's list."

"That means that she is now part of the investigation," the spokesperson said.

PHOTO: The U.S. Marshals Service released a wanted poster for affluenza teen Ethan Couch, who is wanted for allegedly violating his probation.U.S. Marshals Service
The U.S. Marshals Service released a wanted poster for "affluenza" teen Ethan Couch, who is wanted for allegedly violating his probation.

Couch was convicted of four counts of intoxication manslaughter in 2013 but was not sentenced to any jail time; instead he was given 10 years probation -- a punishment considered a mere slap on the wrist by critics, and one that outraged the victims' families.

It was not clear how long he's allegedly been at large.