Sheriff Cuellar told reporters that Agent Ortiz is a 10-year veteran supervisor of the Border Patrol. Numerous workers are also low-income women of color.
Cuellar said Ortiz fled from state troopers and was found hiding in a hotel parking lot in Laredo at around 2 a.m. Saturday. He is suspected of killing four women and kidnapping a fifth woman who alerted authorities after she escaped.
Further details were sparse.
"We have very strong evidence that he is the person who has been killing", Sheriff Cuellar said at a press conference posted on CNN affiliate KGNS's Facebook page.
A woman claiming to be another victim of the agent's alleged attacks escaped from Ortiz and contacted law enforcement.
Three bodies have been found in the northwest area of the county this month, and Cuellar said authorities are investigating whether there may be a fourth body.
The sheriff added that the suspect, who has worked for Border Patrol for a decade, would be charged later on Saturday. They also said Ortiz is believed to have been working alone.
"The manner in which they were killed is similar in all the cases from the evidence", said Alaniz.
The victims, including a transgender woman, had been murdered since September 3.
Investigators are still trying to determine a motive for the killings.
47-year-old Claudine Anne Luera was found on Thursday morning in the brush near Camino Colombia about half a mile east of US-83 North with head trauma. The names of those victims have not been released.
At around 1.30pm local time Saturday the Laredo Police Department released a statement about the case, which says: 'We want to reassure the citizens of Laredo that the community and your families are safe'.
Andrew Meehan, a US Customs and Border Protection spokesperson, said in a statement to CNN that the agency is fully cooperating with investigators.
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