A woman accused of arranging the murder of her ex-boyfriend’s girlfriend has been added to the FBI’s Ten Most Wanted fugitives list.

Federal investigators told a news conference on Wednesday they are offering a $100,000 reward for the arrest of Brenda Delgado.

The 33-year-old is suspected of involvement in the murder-for-hire death of Dr Kendra Hatcher.

The 35-year-old dentist was fatally shot in the head on 2 September last year in the parking garage of her apartment building in Dallas, Texas.

Dr Kendra Hatcher and Ricardo Paniagua

Dr Hatcher was dating Ricardo Paniagua (both pictured), Delgado’s ex

Delgado is only the ninth woman ever to be placed on the FBI’s Ten Most Wanted fugitives list since it was created in 1950.

The FBI said her addition “underscores violent and calculative nature of the crime she’s accused of committing”.

Investigators warned Delgado should be considered armed and dangerous.

Dr Kendra Hatcher

Dr Hatcher was shot in the head

Police have arrested two other people in the case, the accused gunman, Kristopher Love, and the alleged getaway car driver, Crystal Cortes.

According to an indictment, Delgado, who was studying to be a dental hygienist, paid Love with drugs and money for killing Dr Hatcher.

Dallas police say Delgado orchestrated the hit because she was jealous that her ex-boyfriend, Ricardo Paniagua, was dating the victim.

Kristopher Love (L) and Crystal Cortes

The alleged gunman (L) and getaway driver are in custody

Delgado had dated Paniagua, a dermatologist, for two years.

Police questioned Delgado within days of the shooting, but let her go because of a lack of evidence.

She acknowledged she had allowed Cortes to borrow a Jeep, but said she had no idea Dr Hatcher would be killed.

Delgado, a naturalised US citizen, is believed to be in Mexico, where she was born.

Federal officials said on Wednesday that she would not face the death penalty if arrested in Mexico.

Dr Hatcher’s mother appealed for help in finding the fugitive in a video released by the FBI.

“The only thing that I want is Delgado back and for her to serve justice,” said Bonnie Jameson-Cawley.

“That is the only thing that I think about.”