A US border agent has been accused of being a serial killer after allegedly murdering four women in a 10-day killing spree.

Juan David Ortiz, 35, also allegedly injured a fifth women who was able to escape.

He is being held on four counts of murder, as well as charges of aggravated assault with a deadly weapon and unlawful restraint.

The U.S. Border Patrol supervisor is being held on a $2.5 million bond in Texas, after being found at 2am hiding in a truck in a hotel parking lot in Laredo on Saturday.

It is alleged the killings happened over a 10-day period, and Webb County District Attorney Isidro Alaniz said Ortiz continued working as normal throughout that time.

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‘As law enforcement was looking for the killer … he would be reporting to work every day like normal,’ he said.

The body of 29-year-old Melissa Ramirez was found on September 4 after being shot in the head and left in a road in rural northwest Webb County.

She was the mother of two children.

A second victim, 42-year-old Claudine Anne Luera, was found shot and left in the road Thursday morning, badly injured but still alive.

The mother-of-five died at a hospital later that day.

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On Friday Ortiz is accused of picking up a woman named Erika Pena.

She told police she struggled with Ortiz inside his truck, where he pointed a pistol at her, but that she was able to flee.

She made it to a gas station where she found a state trooper whom she asked for help.

According to court documents, Ortiz told investigators that after Pena ran off, he picked up his last two victims, whose identities have not yet been released by authorities.

Jail records don’t list an attorney to speak for Ortiz, who had worked for Border Patrol for 10 years.

Officer Alaniz said the dead are believed to have been prostitutes and that one of them was a transgender woman.

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At least two were U.S. citizens; the nationalities of the others were not known and investigators are still working to determine a motive.

Ortiz is alleged to have acted alone.

The federal agency issued a statement offering its ‘sincerest condolences’ to the victims’ families and saying criminal activity by its employees is not tolerated.