Francisco Morales (left), Eduardo Carranza 

Tucson police have arrested three teens after an attempted armed carjacking at an east-side Walmart parking lot turned fatal. 

Eduardo Carranza, 19, Francisco Morales, 18, and an unnamed 17-year-old boy have been arrested in connection with the incident, according to the Tucson Police Department.  

Officers went to the 24-hour Walmart at 7150 E. Speedway Blvd late Wednesday for reports of a shooting, said Sgt. Pete Dugan, a Tucson Police spokesman.

Juan Andres Allen, 18, was found shot on the ground in the parking lot, Dugan said. Officers and Tucson Fire Department paramedics tried to save Allen but he was declared dead at the scene.

Allen had arrived in an SUV with the Carranza, Morales, and the 17-year-old boy, Dugan said. While armed with guns, Allen and Carranza approached a man sitting inside a parked car. In the attempted carjacking, the man pulled out his own gun and shot Allen multiple times, police said.

The occupant of the vehicle stayed on scene and cooperated with police, who are considering him the victim in this case, Dugan said. 

Carranza, Morales, and the 17-year-old boy drove away in a stolen SUV, leaving Allen behind.

Police found the SUV, first reported stolen on Feb. 20, in the 8600 block of Old Spanish Trail and detained the three teens, Dugan said. They all had gang affiliations, police say.

Carranza faces charges of first-degree murder, attempted armed robbery and attempted aggravated robbery. Morales was arrested on suspicion of one count of grand theft auto and the 17-year-old teen faces felony charges at the juvenile correction center.

The investigation continues.

Anyone with additional information about the case is asked to call 88-CRIME, the anonymous tip line. 

Contact reporter Danyelle Khmara at dkhmara@tucson.com or 573-4223. On Twitter: @DanyelleKhmara