The Attorney General's Office said Friday that 33-year-old Brenda Delgado was detained at a house in the city of Torreon, in northern Coahuila state. She will be held at a Mexico City prison pending extradition proceedings.
Delgado faces charges of capital murder and unlawful flight to avoid prosecution in connection with the death of Dr. Kendra Hatcher.
Hatcher, 35, was fatally shot in the parking garage of a Dallas apartment complex on September 2, 2015. Investigators said Delgado arranged the killing because she was jealous Hatcher was dating her ex-boyfriend and had recently been introduced to his parents.
Neil Hatcher, the victim's brother, said he was notified of Delgado's arrest and was "tickled pink" by the news, according to KTVT.
On Wednesday, the FBI named Delgado one of its "Most Wanted Fugitives."
"Brenda Delgado was able to effectively manipulate everyone she involved in her calculated scheme. Although she didn't pull the trigger herself, she is still responsible for the murder," Thomas M. Class, Sr., Special Agent in Charge of the FBI's Dallas Field Office, said Wednesday.
Delgado initially spoke with investigators about the murder, but officials said she fled the country when it became clear she was a person of interest in the case.
The accused gunman, Kristopher Love, and the woman accused of driving him to the parking garage, Crystal Cortes, were both in custody and facing capital murder charges.
An indictment said Delgado promised to give Love drugs and money, from herself and a drug cartel, to kill Hatcher.
An extradition agreement between the U.S. and Mexico meant Delgado will not face the death penalty, KTVT reported. Dallas County District Attorney Susan Hawk has said Delgado could be sentenced to life in prison if convicted.