Two decomposing bodies found in a car in an Arizona parking lot were a missing young woman and her stalker, according to reports.

25-year-old Doris Aguilar had apparently been shot by Juan Cuellar, 51, who then killed himself with a shot to the head, local authorities told Arizona Family.

The pair were discovered July 7 in a gym parking lot near Phoenix, with their bodies having been in the car for several days.

Before her death Aguilar told family and friends Cuellar was dangerous and wouldn’t leave her alone according to private investigator Steve Fischer, who spoke to Arizona Family about the “sick and twisted” crime he has been investigating for Aguilar’s family, many of whom live in Honduras.

Aguilar, known to family and friends as a fitness fanatic, had been missing since July 1.

“She did tell her family and important people in her life about this person, and that if anything happened to her, he was responsible,” Fischer told Arizona Family, adding: “He scared her.”

Fischer said Cuellar worked at the same building as Aguilar until about a year ago when he was fired.

The stalker is alleged to have kept sending threatening messages to Aguilar and showing up unannounced at her gym.

Aguilar became so fearful of Cuellar, she changed gyms in order to avoid him, according to Fischer.

But on June 27, Cuellar made a haunting Facebook post, seemingly aimed at Aguilar.

“Getting my Lifetime [gym] membership back. See you soon,” Cuellar wrote on Facebook, according to Fischer.

Police found Aguilar’s car unlocked with her belongings still inside outside the Christown Shopping Center on July 1 after she was reported missing by family members.

Six days later Aguilar and Cuellar’s bodies were discovered in a rented sedan in a steakhouse parking lot near Aguilar’s former gym.

Fischer said Cuellar rented the car as part of a “luring scheme” to get to Aguilar, but Fischer doesn’t think Aguilar was killed in the rented vehicle.

“What I’ve been told, there is no biological evidence in the vehicle that she was shot in the car, so it looks like she was moved,” Fischer said.

Fischer said Cuellar left a note inside the vehicle to make it appear as though Aguilar committed suicide.

“He tried to stage it to make it look like she killed herself,” Fischer told Arizona Family.

Aguilar’s phone data showed her phone was turned off July 1 shortly after 8 p.m., according to Fischer.

Phoenix Police Sgt. Rob Scherer told the outlet investigators are using surveillance video starting with where Aguilar’s car was found to piece together the details of the crime.

Fischer and The Phoenix Police Department did not immediately respond to The Post’s enquiries Sunday.