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The shooting of a man wanted in connection with an armed robbery in February has been ruled justified, an official said Monday.

Officer Claude Ralls, a 26-year Tucson Police Department veteran, will not face criminal charges in connection with the death of Louis Richard Arboisiere, said Andrea Esquer, a spokeswoman for the Attorney General's Office in Arizona.

The Pima County Attorney's Office turned the investigation over to that office because the victim in the shooting was related to someone in the County Attorney's Office, said Isabel Burruel-Smutzer, a spokeswoman for the county attorney.

Arboisiere was shot to death Feb. 28 outside a home in the 700 block of North San Rafael Avenue, near West St. Mary's and North Silverbell roads.

The shooting came after Ralls spotted a white Chevrolet Malibu sought in a Sahuarita armed robbery, Tucson police said. The vehicle was also tied to three other thefts in the days leading up to the incident.

Before the fatal shooting, Ralls had called for backup officers who took up positions behind the home at his direction, according to a letter sent by the Attorney General's Office to Tucson police.

During that time, Ralls saw a man and woman walk out of the house who resembled a couple in surveillance video from one of the thefts. He ordered them to get on the ground, and the woman ran back inside, the letter states.

Ralls said he saw Arboisiere tucking a gun into his belt and putting his shirt over it and continuing to walk toward the Malibu. He ordered Arboisiere at gunpoint to get down, but Arboisiere didn't comply.

Ralls said he saw Arboisiere pull something from his waistband as he got into the car. Ralls ran to his vehicle and moved it to box the car into the driveway.

Ralls got out and commanded Arboisiere to stop as he attempted to back out, narrowly missing Ralls, who fired at the car five times. Arboisiere was hit three times.

Investigators later were unable to find a firearm, and no witnesses reported seeing Arboisiere with one, according to the letter. Witnesses did substantiate Ralls' claim that Arboisiere nearly ran him over.

Arboisiere's mother told officials that her son was diagnosed with manic-depression at 17 and that she believed he was in the "manic phase" of the disorder when the incident occurred.

"(Officer) Ralls had a reasonable basis to believe that deadly force was necessary to protect himself from the threat of deadly force by the car or possible pistol," the attorney general document said.