Jesus Campos, the Mandalay Bay security guard who's a key witness in the Las Vegas shooting, skipped town just days after the massacre, a new report reveals.

On Wednesday, Fox News' Tucker Carlson received a document showing that Campos reentered the country from Mexico a week after the shooting.

The Customs and Border Patrol document didn't say how long he had been in the country, or his reason for traveling south of the border.

All it showed was that he crossed back into the U.S. on October 8 via the San Ysidro border check in California and appeared to be driving a rental car with California plates.

Fox News obtained a document showing Jesus Campos (right) crossed into the U.S. from Mexico on October 8 - a week after the Las Vegas shooting. He's pictured appearing on the Ellen show for his only interview shortly after returning to the country

It's unclear how long Campos was out of the country. But the document shows he crossed back into the U.S. at the San Ysidro crossing in California on October 8

Fox News also learned that he traveled to Mexico in January too, crossing back into the U.S. at the same border crossing. That time he was driving his own car with Nevada plates.

The document raises several questions - the biggest being why investigators would have let Campos out of the country so soon after the shooting when he was one of the key witnesses.

It's also unclear how he physically could have completed the trip, driving hundreds of miles when he had recently suffered a gunshot wound to his leg.

Fox News also figured out that Campos was not licensed as a private security guard in Nevada. When they called the Clark County Sheriff's Office to see what kind of licensing is required to work as a security guard at a casino, they were hung up on.

'Jesus Campos is a victim and we don’t speak about victims,' a sheriff’s spokesperson reportedly said.

Campos was shot at Las Vegas gunman Stephen Paddock when he went to the 32nd floor to look into an emergency exit door that wasn't opening. Above, officers responding to the shooting on October 1

Questions continue to swirl around Campos' place in the shooting timeline. Initial reports were that Campos was shot after gunman Stephen Paddock had stopped shooting. Then police then changed the timeline to say he was shot before the shooting commenced. The most recent timeline says he was shot shortly after Paddock went on the rampage.

Campos' behavior after the shooting has only created more questions about the shooting.

Shortly after the shooting, he scheduled several interviews with all the major news networks. Then he cancelled at the last minute and essentially went missing.

He resurfaced two weeks ago when he sat down for an interview with Ellen DeGeneres - saying it would be the first and only time that he talked about the matter.

In the interview, Campos gave his recollections of the night, but didn't reveal much new information. Ellen, who typically interviews actors and viral stars, didn't press him with questions on the ever-changing timeline.

DailyMail.com revealed earlier this month that it was Campos' employer, MGM, that kept him off the air for the most part.

Campos was pressured into giving his only interview to Ellen because the giant company that owns the Las Vegas casino feared he would spill the beans about the shooting timeline if he was grilled by real journalists, DailyMail.com has learned exclusively.

MGM is worried that families of the 58 people murdered as well as many of the 546 injured in the Mandalay Bay massacre will launch lawsuits potentially worth billions of dollars against the company, sources told DailyMail.com.

And they thought Campos might not keep his story straight under the pressure of the TV lights and tough questioning.

That is why Campos, 25, appeared on a daytime chat show hosted by a fast-talking, dancing comedienne, rather than take questions from TV hardhitters such as Fox News’ Sean Hannity, NBC News or ABC News.

‘MGM was behind the decision to call off all the interviews and did a deal with Ellen, knowing she would not play hardball on the timeline as long as she had the exclusive,’ a TV insider told DailyMail.com.