Two Long Beach police officers who shot an unarmed man to death as he ran down a beach-side staircase in 2014 will not face criminal charges, the Los Angeles County District Attorney’s office said this week.

The deadly shooting of 36-year-old Jason Conoscenti sparked outrage after video of the incident was posted on YouTube, but in a letter dated Tuesday, prosecutors said they did not find enough evidence to prove beyond a reasonable doubt that either officer “used unreasonable force to apprehend a dangerous fleeing felon.”

Officers Eric Barich and Salvador Alatorre shot a total of 10 rounds, hitting Conoscenti seven times on the afternoon of April 27, 2014, according to the letter.

He collapsed at the bottom of the staircase that led to the beach from a cul-de-sac in the Alamitos Beach neighborhood where 14th Place dead-ends.

Two tall apartment buildings flank the cul-de-sac, and several people filmed the shooting from above, according to the letter.

Videos on YouTube appeared to show Conoscenti being shot from behind, but, according to prosecutors, Barich and Alatorre were with a group of officers waiting for Conoscenti on the beach below.

The two officers told investigators they opened fire after seeing Conoscenti reach for his waistband as he ran toward them.

The officers said they believed Conoscenti had a firearm because moments earlier they thought they’d heard gunshots coming from the top of the staircase, according to the letter.

But prosecutors wrote that the sound they heard was actually sheriff’s deputies firing less-lethal rounds at Conoscenti, who then fled down the staircase.

“Although Barich and Alatorre’s belief was mistaken, there is insufficient evidence to prove beyond a reasonable doubt that Barich and Alatorre were unreasonable in their belief that Conoscenti had engaged in a gun battle with LASD deputies moments prior to seeing him flee down the stairs toward the beach,” according to the letter.

Conoscenti’s run-in with police began earlier that day in Compton when he allegedly tried to rob a Target store and then menaced a pair of sheriff’s deputies with scissors when they attempted to detain him, according to authorities.

Police said Conoscenti then got into a white Isuzu Rodeo and led officers on a 12-mile chase that ended in the cul-de-sac. After a 25-minute stand-off, Conoscenti got out of his car, tossed aside a large wooden stick he’d been holding and headed toward the staircase leading to the beach, according to the letter.

Sheriff’s deputies fired the less-lethal rounds at Conoscenti, but he continued to flee, chased by a Long Beach police K9 unit that had been released, prosecutors wrote.

Conoscenti had repeatedly ignored authorities commands to surrender at the top of the stairs, and he continued toward police on the beach even as they yelled for him to “stop” and “get on the ground,” prosecutors wrote.

The officers’ bullets struck Conoscenti in the chest, hip, legs or foot, according to details of a medical examiner’s report contained in the district attorney’s letter. Three of those shots were “rapidly fatal,” according to the report.

The medical examiner also found amphetamine, methamphetamine and ephedrine in Conoscenti’s blood, prosecutors wrote.

Barich and Alatorre are both still employed at the Long Beach Police Department and working assignments, spokesman Sgt. Brad Johnson said.

The department conducts its own review of all shootings by officers, but Johnson said he could not reveal its conclusions.

Last month, Long Beach paid $2 million to settle an excessive-force lawsuit brought by Conoscenti’s family.