REDWOOD CITY — Prosecutors have decided not to charge the deputies who repeatedly shocked an unarmed black man with a Taser last October, leading to his death, the San Mateo County District Attorney’s Office said Friday. The officers had stopped the man, Chinedu Okobi, 36, for jaywalking on a busy street in Millbrae.

Along with reports detailing the office’s decision, District Attorney Steve Wagstaffe for the first time publicly released video of the Oct. 3 arrest, a compilation of police dash-cam footage and footage taken by a witness to the fatal encounter.

WARNING: This video contains graphic content. Viewer discretion is advised. CLICK HERE if you have trouble viewing the video on a mobile device.

Okobi, the brother of a Facebook executive, was the third person to die in San Mateo County last year after being shocked with a Taser during an arrest. In each of those cases, Wagstaffe decided not to charge the officers involved, saying their actions were reasonable.

The law-enforcement officers involved in Okobi’s arrest were Sgt. David Weidner and deputies John DeMartini, Alyssa Lorenzatti, Joshua Wang and Bryan Watt.

“In this case, I have found that the four deputy sheriffs and the sheriff’s sergeant did not violate any California penal code law in their conduct on that day,” Wagstaffe said at a news conference in Redwood City on Friday.

Ebele Okobi, Okobi’s sister, said her family was “devastated” by the D.A.’s decision, “but we are not surprised.”

Bringing criminal charges against the deputies, she said at a news conference held late Friday in Oakland, “would have shown that a person we love mattered to this county. They would have shown that this county does not tolerate police abuse of power.”

Instead, Okobi said, “What this decision shows to us, to our family — it tells us that we are not safe in San Mateo County. And if you’re black, or mentally ill, or if you need help, you could be electrocuted to death by those who are meant to protect and serve.”

Activists have called for the deputies to face criminal charges for Okobi’s death, and held a demonstration Friday evening on El Camino Real near the site of the fatal confrontation. Organizers are calling for a moratorium on the use of Tasers by San Mateo County law enforcement officers, a state investigation into Okobi’s death and the establishment of a civilian oversight committee for the San Mateo County Sheriff’s Office.

The Sheriff’s Office said in a statement released Friday that it has no plans to stop using Tasers. Okobi’s death, the statement said, was a result no one wanted.

“Our hearts go out to Chinedu Okobi and his family as well as everyone affected by this terrible situation,” Sheriff Carlos Bolanos said.

On Saturday, a day after Wagstaffe announced the Okobi decision, the Sacramento County District Attorney’s Office announced it will not charge the two officers who fatally shot an unarmed Stephon Clark, who was black, in a Sacramento back yard in March 2018, a shooting that further galvanized the national and state police accountability movements.

In its initial account of Okobi’s death, the Sheriff’s Office said that at the time of the encounter, he was running in and out of traffic on El Camino Real in Millbrae, and assaulted a deputy before being shocked with the Taser.

But Ebele Okobi, after viewing video of the encounter last fall, said what the footage showed was at odds with that narrative. The videos appear to support her view, clearly depicting her brother walking, not running, as the deputies initially tried to stop him, and hitting one of the deputies only after he had been shocked several times. The Sheriff’s Office acknowledged the discrepancy Friday, but said the mistakes were made in a rush to inform the public.

And while the sheriff’s deputies were recorded speculating that Okobi was on drugs, the coroner’s report released Friday said no drugs had been found in his system.

The video compilation shows Okobi crossing El Camino Real near Millwood Drive, walking outside of the crosswalk, and Wang, in his patrol vehicle, trying to conduct a police stop. Wagstaffe said Friday that deputies had been ordered to enforce jaywalking laws more stringently in the wake of pedestrian collisions in the area.

After Wang says to Okobi, “Hold up a minute,” Okobi appears in the video to disregard the command, walking away from the officer’s car. He continues walking in the street and eventually steps up onto the sidewalk on the west side of El Camino. “Let’s go over here and talk on the sidewalk,” Wang says in the video, but Okobi walks away again.

The report described Okobi as “running” between six lanes of traffic, “causing motorists to maneuver to avoid hitting him.” The videos show Okobi walking briskly at best, while a few cars slowed down and drove around him.

In a three-minute sequence that ends with Okobi’s arrest, Lorenzatti, DeMartini and Wang try to handcuff or subdue Okobi on the sidewalk, and he pushes them away and keeps walking. Wang fires his Taser, which hits Okobi and causes him to fall forward to the asphalt. The deputies repeatedly order him to roll over onto his stomach. Okobi is heard yelling, “What did I do?” and “Get them off me!” referring to the Taser barbs.

As he lies on his back, legs flailing and screaming in pain, Okobi is heard to say, “Somebody please help me!” and then, “I’m lost” and “spread the word of God.” During the struggle, now also joined by Watt, Wang deploys his Taser two more times. Eventually, Okobi gets to his feet and runs across El Camino Real.

In the video, deputies catch up to Okobi and another physical struggle ensues. Wang tries to hit Okobi in the leg with his baton. Then Okobi punches Wang in the face, prompting the deputy to try and pepper spray Okobi, but the spray appears to miss its target and hit the other deputies.

In their accounts to investigators, the deputies noted that in several instances they felt overpowered by the 6-feet, 2-inches tall, 330-pound Okobi. In the video, under the command of Weidner, the deputies get on top of Okobi to subdue and handcuff him. After sitting him up, the deputies appear to realize that Okobi is not responding.

The investigation showed that Wang deployed his Taser seven times, but that the final four times produced either only a partial charge or no charge. Emergency medical personnel who responded to the scene reported that they noticed some movement from Okobi, but soon after, they could no longer find his pulse and began working to revive him.

At 2:17 p.m., about 80 minutes after the first encounter with Okobi, he was pronounced dead at Mills Peninsula Hospital.

In a 55-page “use-of-force” analysis commissioned by Wagstaffe, and conducted by Jeffrey Martin, a retired San Jose police sergeant, Martin concluded, “There is currently no evidence to suggest that any of the deputies, either individually or collectively, took any actions that would, with reasonable foreseeability, cause the death of Mr. Okobi.”

In an audio recording of the encounter, deputies on the scene speculated that Okobi was under the influence of drugs.

But the San Mateo County Coroner’s report said no evidence of drugs was found in the autopsy of Okobi’s body. Okobi died as a result of “cardiac arrest following physical exertion, physical restraint, and recent electro-muscular disruption,” the report said, referring to the Taser shock.

John Burris, a civil-rights attorney representing the Okobi family, said the deputies’ assumptions about drug use and their actions needlessly escalated what should have been a nonviolent interaction with a man who clearly had mental-health issues and had committed only a minor infraction.

“This was all (a) cop-initiated confrontation,” Burris said. “Cops created a conflict, created a confrontation, and then fought their way out of it by beating this man up and ultimately Tasering him, then finally killing him. It’s outrageous.”

Several dozen demonstrators, many holding candles and signs reading “Justice for Chinedu,” gathered Friday evening near where Okobi struggled with deputies the afternoon he died.

Merri Jo Musni, a San Francisco nurse who said she has known Okobi’s mother since she was pregnant with him nearly four decades ago, held a photo of Okobi out to passing cars on El Camino Real. Musni said the deputies did not have a legitimate reason to stop Okobi, calling the jaywalking allegation “laughable,” and escalated the encounter when they should have defused it.

“There was not a concern for his safety,” Musni said. “He was targeted — profiled.”

Musni said she was “ashamed” but not surprised by the district attorney’s decision.

Protesters called for the recall of Wagstaffe and Bolanos, and speakers asserted Okobi’s jaywalking would not have attracted law enforcement attention if he were white.

“If he were a white man he would be here with us today,” San Mateo resident Ginny Kraus told demonstrators. “Because he was a black man he was killed for jaywalking.”

Staff writer Jason Green contributed to this report.