Arizona EMT, 20, dies 12 days after being shot in the head by crazed gunman while sitting in ambulance with his colleague and police still don't know the motive

Pictured: Leslie Stephen Scarlett, 35, who police say killed EMT Jacob Dindinger on July 18 during a violent crime spree

A 20-year-old Tucson emergency medical technician who was critically wounded by a gunman in a shooting rampage last week has died, his employer said Friday.

Jacob Dindinger died 12 days after being hospitalized following the tragic shooting on July 18, American Medical Response revealed in a brief statement.

'Our thoughts are with Jacob and his family as we honor his life and his service,' the company said.

Police said several other people were also wounded or grazed by gunfire during a violent crime spree at the hands of Leslie Stephen Scarlett, 35, on July 18. 

Scarlett's other victims included a neighbor, 44-year-old Corey Saunders, who was fatally shot while trying to extinguish a house fire and the gunman's girlfriend, 36-year-old Jennifer Fells, who was found dead inside the house after the fire.

Saunders was shot to death in front of his 11-year-old son, according to Tucson.com. 

Dindinger, who had been working as an EMT for only four months at the time of his death, was hospitalized in extremely critically condition with a gunshot wound to the head. He was hit while sitting in an ambulance with a co-worker, 21, who was shot in the arm and chest but survived.

The two EMTs had been responding to an unrelated call at Quincie Douglas Center at Silverlake Park when Scarlett arrived and opened fire.

Jacob Dindinger died 12 days after being hospitalized following the tragic shooting, American Medical Response revealed in a brief statement

Bodycam footage of Tucson Police Officer Danny Leon responding to the chaotic shooting scene on Irene Vista. Leon shot suspect Leslie Scarlett, 35, July 18

Scarlett, who Tucson PD described as having 'mental health issues,' died July 21 after being wounded in an exchange of gunfire with Officer Leon, finally ending the three-day rampage

He died of his injuries Thursday night, according to a statement from Gov. Doug Ducey. 

The deadly crime spree was first brought to authorities' attention after police received a phone call about a house fire at 3:45pm.

As the Tucson Fire Department and neighbors worked to douse the flames, Scarlett returned to the home after killing Dindinger and opened fire on emergency personnel and neighbors.

A 17-year veteran of the fire department was shot in the arm, and was released from the hospital on Sunday night, according to KOLD News 13.  

Scarlett's other victims included a neighbor, 44-year-old Corey Saunders, who was fatally shot while trying to extinguish a house fire and the gunman's girlfriend, 36-year-old Jennifer Fells , who was found dead inside the house after the fire

Tucson Police investigators work at the scene of a house fire authorities believe Scarlett is responsible for, where a body was found in Tucson on July 19

Police secure the scene at Quincie Douglas Center at Silverlake Park, where Scarlett had shot and killed the 20-year-old EMT and injured his 21-year-old coworker

Scarlett, who Tucson Police Chief Chris Magnus described as having 'mental health issues,' died July 21 after being wounded in an exchange of gunfire with Tucson Police Officer Danny Leon. 

Pictured: Cory Saunders, 44, was shot to death in front of his 11-year-old son by Scarlett after he killed Dindinger

'I am beyond grateful that Officer Leon had the skill, courage and presence of mind to end this suspect's rampage,' the chief said of the eight-year Tucson Police Department veteran, the news outlet reports.

Tucson Mayor Regina Romero echoed Magnus' sentiments. 

'Despite having gunshots fired right at him, demonstrated incredible composure and bravery in neutralizing the threat,' Romero said of Officer Leon. 

'His actions were heroic and likely saved lives.' 

Meanwhile, the governor ordered that flags at all state buildings fly at half-staff Saturday in Dindinger's honor.

A paramedic who was a co-worker of Dindinger, and a firefighter also were wounded, and a second neighbor was grazed by a bullet. 

Scarlett had previously been sentenced for a six-year prison sentence following a 2007 conviction for an attempted armed robbery. He was released in August 2013,  KOLD News 13 reports. 

A motive for the attack remains unclear, police said.