Ortiz, a 10-year Border Patrol veteran, was arrested early on Saturday after a fifth woman who had been abducted managed to escape and notify authorities.
The 35-year-old suspect, an intel supervisor for the Border Patrol, was found hiding a vehicle park in Laredo, Texas, at around 2am after he initially fled police on Saturday.
"This case broke open yesterday with an aggravated kidnapping that led to a lookout for a suspect, in this case Ortiz, so he will be looking at charges of aggravated kidnapping", Alaniz said. But authorities declined to discuss the evidence or say how the women were killed.
Alaniz said the victims are believed to have been prostitutes and that one of them was a transgender woman.
Webb County Sheriff Martin Cuellar said in a statement: "We feel that our efforts have gathered strong evidence against this killer". That woman escaped and alerted police.
Investigators discovered two more bodies, one on Friday and one on Saturday in a remote area along Interstate Route 35.
When troopers found him on a parking lot, Ortiz tried to escape on foot and was eventually found in a back of a truck. His known victims were all believed to have worked as prostitutes, and according to a CBS News report, investigators have not ruled out the possibility of more victims. We have agreed to work together on the hiring and professionalism of border patrol agents.
The victims were shot in the head, according to an affidavit. She was taken to a local hospital where she later died.
Alaniz says authorities are still trying to determine a motive for the killings.
Ayala has lived in the South Texas city her entire life, and said she didn't expect something like the serial murders to happen there. Alaniz said two of them were US citizens but the nationalities of the other two were not yet known.
"Our sincerest condolences go out to the victims' family and friends". Pena said that when she mentioned Ramirez's murder the week before, Ortiz "began to act weird", according to the affidavit.
"It's super unfortunate and tragic", Alaniz said.