Texas teenager Ethan Couch and his mother Tonya Couch, who were arrested last week in Puerto Vallarta, Mexico, are both facing extradition to the U.S. after Ethan allegedly killed four people in a wreck in Texas back in 2013.

18-year-old Ethan is facing a case after being speculated to have violated his parole while 48-year-old Tonya has recently waived her right to fight extradition to Texas during a Tuesday court hearing, Reuters reports. The latest developments in their cases show that both are gearing up as they face Ethan's deadly drunk-driving case to court.

Fox News Latino revealed that Ethan already hired high-profile lawyer Fernando Benitez, who was known for taking the case of former U.S. Marine Andrew Tahmooressi back in 2014 in an unintentional entrance in Mexico while carrying three registered firearms. The case was favorable to Benitez's client as he was released after seven months.

Benitez's recent client Ethan, who is still on the run, is believed to have fled to Mexico with his mother Tonya, and the famed lawyer had only this to say on his recent Twitter post, writing, "No further statement nor comment regarding my client's immigration case in Mexico will be issued; no interviews either."

Meanwhile, Benitez previously questioned the process of how Mexican officials used a deportation proceeding instead of extradition, which he believes to be more suitable in this case, the publication reports.

"They wanted to use a 'fast-track' process," Benitez said told BBC. "They said this guy didn't stamp his passport on the point of entry so we are going to kick him out."

Benitez further explained and urged that extradition was the right choice for the mother-son case. "In a sense, what is happening is that they are using deportation in lieu of extradition. I'll bet you a million dollars that 99.9 percent of the tourists in Puerto Vallarta as we speak did not stamp their passport -- are you going to deport all of them, too?"

Meanwhile, on Tonya's charge of hindering apprehension, she was previously flown to Los Angeles from Mexico last week and, if convicted, could face two to 10 years in prison, per Reuters.

The case became the center of attention in recent months after a psychologist testified for Ethan, diagnosing him of having Affluenza, a condition where kids, usually from rich families, are too spoiled and do not have an understanding between right and wrong. Ethan's camp hopes that the affluenza will help their case, however, the American Psychiatric Association has never recognized it as a mental or medical condition.