Following Stephen Paddock's October 1st massacre in Las Vegas, Campos, who may or may not have been shot by Paddock, flaked on a press conference that he reportedly scheduled then went missing for days before suddenly resurfacing on the 'Ellen' show.

Now, Fox News has uncovered Customs and Border Patrol documents showing that Campos apparently crossed the border into Mexico days after the Vegas massacre.  Campos reportedly crossed the border at the same place in January but, for whatever reason, was driving a rental car this time around instead of his own vehicle.  Per the New York Post:

Mandalay Bay security guard Jesus Campos mysteriously left the country just days after the Las Vegas massacre, a report says.
 
Customs and Border Patrol documents obtained by Fox News show that the 25-year-old entered the United States from Mexico at the San Ysidro border crossing in California — one week after the mass shooting.
 
It's unclear how long Campos was out of the country. The documents only show that he entered back into the US.