Brenda Delgado orchestrated the murder-for-hire of a Dallas dentist who was dating her former boyfriend, authorities said.
After her accomplices killed the other woman on September 2, Delgado fled to Mexico, according to authorities.
Mexican authorities arrested her Friday, two days after the FBI added her to its list of 10 Most Wanted Fugitives. She was taken into custody without incident in the city of Torreón.
Delgado was the ninth woman placed on the FBI's 10 Most Wanted Fugitives List since it was created in 1950.
The 33-year-old was indicted on capital murder charges after the accused accomplices waited for dentist Kendra Hatcher at a parking garage in Dallas, then shot her.
"Although she didn't pull the trigger herself, she is still responsible for the murder," said Thomas Class Sr. of the FBI's Dallas division.
For months, the FBI said, Delgado allegedly plotted to kill Hatcher.
"She was just waiting for the right opportunity, and the right people to carry it out," the FBI said.
Delgado finally lured two accomplices with promises of money and a steady supply of drugs from her cartel sources, authorities said.
The accomplices allegedly killed Hatcher while she was gathering items from her car in her apartment complex's parking garage.
'She was jealous'
Days before the killing, Delgado discovered her ex-boyfriend and Hatcher were planning to vacation in Mexico, according to authorities.
Police arrested both co-conspirators, but Delgado allegedly fled the country after investigators interviewed her about the killing.
A federal fugitive warrant was issued in October.
"The only thing that I want is Delgado back and her to serve justice," Bonnie Hatcher, the victim's mother, told the FBI. "That is the only thing that I think about."
No death sentence
The FBI had offered up to $100,000 for information leading to her arrest.
Mexico is opposed to the death sentence, and Dallas authorities had pledged to seek life in prison instead.
"We're trying to get her extradited back here," Dallas County District Attorney Susan Hawk told CNN affiliate KTVT
"In order for us to do that, one of the conditions was the death penalty had to be off the table. She's still charged with capital murder, which carries a life sentence