Amid questions about any cooperation Laurean's wife might have provided, Sutherland said that "a number of questions have been raised about Christina Laurean ... and our office has continued to repeat the fact that she was a cooperating witness with this investigation. That status has not changed."
Pressed for further information on any investigation into Christina Laurean's activities, Hudson said, "Let me just say this -- from all the evidence I reviewed, I feel confident saying that she is torn. She's torn between what occurred and her love for her husband."
But authorities did say they don't believe she helped him while he was on the run.
"Cesar Laurean repeatedly asked for resources from family members, and those family members denied those resources, specifically Christina denied those" requests, Sutherland said.
Magdalena Guzman, a spokeswoman for the Michoacan, Mexico, state prosecutor's office, said Thursday that Laurean told arresting authorities that he had only about 10 pesos -- roughly $1 -- when he was captured, supporting the notion that Laurean's family had cut him off.
Christina Laurean has remained silent on the events surrounding her husband's investigation. Christopher Welch, her attorney, explained that silence Friday, noting that she is also a Marine, and that the Corps has prohibited her from speaking out about the case.
During the course of the investigation, authorities said Christina Laurean, the mother of Cesar Laurean's toddler, handed over notes left by her husband in which he allegedly claimed that Lauterbach had slit her own throat before he burned and buried her body.
Sutherland added that if new information was developed that required new arrest warrants in the case, they would be issued.
A senior law enforcement official told ABC News that Mexican authorities arrested Laurean, 21, Thursday evening in a town in the Mexican state of Michoacan, after he was spotted on the street.
Mexican police on an anti-kidnapping operation reportedly spotted Laurean wandering the street and became suspicious when they realized he didn't speak Spanish very well. He was taken into custody and later identified in part by his extensive tattoos, The Associated Press reported.
"He was walking down the street. He did not resist," said FBI spokeswoman Amy Thoreson. "We had FBI agents, NCIS agents as well as the Mexican authorities [there] at the time."
The AP briefly interviewed Laurean Thursday night at the Michoacan state attorney general's office in that state's capital city of Morelia. The reporter noted that a shackled Laurean teared up at times and appeared slightly disoriented. "You know my name. You know who I am," the news service quoted a bearded Laurean as saying.
Chained at the wrists and ankles, Laurean stared straight ahead as he answered a series of questions from an AP reporter. Asked whether he had anything he wanted to say, Laurean reportedly replied, "Proof." Asked what he would do next, he asked "Do I have a choice? … I don't know."
Antonio Garza, U.S. ambassador to Mexico, confirmed in a statement that authorities had arrested Laurean in the town of Tacambaro, also in the Mexican state of Michoacan.