Arturo Valtierra was arraigned Tuesday in a West Texas courtroom. The suspected serial rapist stands accused of attacking, robbing and beating at least three women in El Paso.
He pleaded not guilty to the charges.
Investigators say Valtierra broke into his victims' homes late at night and watched them before he attacked.
According to police, that frightening tactic was also used in North Texas. They claim DNA evidence has linked the suspect to a sexual assault in Fort Worth.
The attack happened in September, 2012 on Little Mohican Drive. Tarrant County prosecutors filed aggravated sex assault charges against Valtierra last week.
Fort Worth police Sex Crimes Unit Detective J.W. Galloway Sr. told News 8 that investigators never lost hope in identifying a suspect in their case because they had biological evidence.
"Any time we have that type of evidence, we always have hope," he said. "In this case, that evidence proved to be critical.”
Galloway said the victim was relieved to learn of Valtierra's arrest and was able to identify him from photos.
"She was emotional when told the suspect had been located and in custody," Galloway said. "It certainly eased some of the victim's concerns that the suspect was no longer in the Fort Worth area."
Fort Worth police currently have just one case against Valtierra, but Galloway said the suspect might be responsible for other assaults in North Texas because of the amount of time he spent here.
He urges other possible victims who might have been afraid to file a report to come forward.