Just before dentist Kendra Hatcher was shot dead in an Uptown garage, Crystal Cortes asked the armed stranger hiding in the back seat of the Jeep she was driving a question.

Cortes wanted to know how much money he was getting paid to rob Hatcher, according to an FBI affidavit released Monday. He replied that it was "none of her business."

Moments later, authorities say the gunman, Kristopher Love, spotted Hatcher returning home and got out of the Jeep. Cortes heard a single gunshot and Love soon jumped back into the Jeep holding two purses, authorities said. As they drove away, Love threatened Cortes, 23, telling her that if she snitched, she and her 6-year-old son "would be next."

Those were among new details released Monday as the U.S. Attorney's Office announced an additional federal gun charge for Love, 31, who has been jailed since Friday on a capital murder charge.

Police say the jealous ex-girlfriend of Hatcher's boyfriend, Brenda Delgado, 33, orchestrated the Sept. 2 attack. She is wanted on a charge of capital murder and has been on the run since Friday. The dental hygienist plotted the attack on Hatcher because she was "upset that her former boyfriend was dating the victim and had recently taken her to San Francisco to meet his parents," according to the affidavit.

Hatcher, 35, was shot dead shortly before 7:45 p.m. in her luxury Uptown apartment garage in the 1700 block of Cedar Springs Road. The following day, she and her boyfriend, dermatologist Ricardo Paniagua, 38, were supposed to leave for Mexico together, according to the affidavit. Paniagua and Delgado dated for two years and broke up earlier this year, police said.

Cortes admitted to being the getaway driver and agreeing to help rob Hatcher and steal her driver's license in exchange for $500, police said. Cortes was arrested on a capital murder charge two days after the killing. Her bail is set at $500,000.

Cortes told police she didn't know Love, who she only identified as "Kris," the affidavit says.

Before the killing, Cortes met with her male friend and Delgado at a Dallas apartment complex. Cortes told police Delgado asked the friend, who is not named in the documents, if he knew "someone that could take care of something for her," the affidavit states.

The friend "responded that he could find someone."

In the hours prior to the murder, Cortes called Delgado's cell phone to try to "back out" of the plan, but Delgado didn't answer, the affidavit says. So Cortes continued with the plan to pick up Love right before the shooting, the affidavit says.

After the shooting, Cortes dropped off Love at an intersection in Dallas and she went to another location to meet Delgado, who took one of the victim's purses, police said.

Cortes provided police with Love's cell phone number, the affidavit states. Records show the number was used to communicate with Delgado and Cortes' phones around the time of the shooting.

Authorities tracked the cell phone to Love's car.

Under the front seat, police found a .40-caliber Smith & Wesson pistol. Hatcher was killed by a .40-caliber bullet to her head, police said, adding that they found the murder weapon.

Love admitted to robbing Hatcher, police said. He is now also charged with being a convicted felon in possession of a pistol. He remains in Dallas County Jail with bail set at $2.5 million. According to public records, he has previously been convicted in Tennessee of aggravated assault, aggravated robbery and burglary of a residence.

Love's girlfriend defended him in an interview with Fox 4 News.

"I couldn't see him going and taking a life, and being away from his kids," Merika Swint told the station. "I make plenty of money. I can't see him being hired for a hit man to take someone's life and he'll know he'll be away from his kids."

If convicted of the capital murder charge, Love faces up to life in prison or the death penalty. The federal gun charge carries up to 10 years in prison.

In a statement late Monday, the Hatcher family thanked Dallas police and the community, and asked for continued help from the community until the case is complete.

"Our family would like to thank Detective Barnes and the Dallas Police Department for all their hard work and persistence.

"Kendra loved Dallas, and we thank the community for providing information that aided in the progression of the case.

"We grieve the loss of Kendra: doctor, daughter, sister, aunt, Godmother, and friend. And now we can have more closure with these answers. We ask the community to continue helping until this case is complete.

"The loss of Kendra has stretched far and wide, and she continues to leave her legacy of love and light."