LAS VEGAS (AP) — The mother of a Nevada inmate who died days after he was beaten by corrections officers is suing prison officials and the coroner’s office in Las Vegas, accusing them of covering up her son’s death.

Annette Walker alleges in a lawsuit filed late Thursday in Clark County District Court that her son, Christian, was viciously beaten by guards last April and left to die at High Desert State Prison near Las Vegas, and that a larger pattern of excessive force exists within the state’s prison system.

“This lawsuit stands for something much, much larger than just Christian,” the lawsuit says. “It stands for all those who came before and will come after Christian Walker.”

Walker’s face was swollen and smeared with blood when he died in custody. According to the lawsuit, he also suffered head trauma and other injuries to his torso and extremities that required stitches.

The medical examiner concluded the injuries didn’t cause or contribute to his death.

Lary Simms, a forensic pathology expert who worked for 25 years as a medical examiner in Las Vegas and Chicago, reviewed Walker’s autopsy and medical records for the plaintiffs. He recommended a “complete re-evaluation” of Walker’s death.

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Simms wrote in an affidavit filed with the lawsuit that the medical examiner’s “microscopic description” of Walker’s apparent heart problems in the autopsy report doesn’t square with the final ruling that it was a natural death caused by heart problems.

The state Department of Corrections and its director, James Dzurenda, several prison administrators, medical staff and unnamed guards, along with the Clark County coroner’s office, are listed as defendants. Both the corrections department and the county declined to comment Friday.

Walker was 44 when he died on April 15, 2023. He had spent more than two dozen years behind bars after being convicted of second-degree murder in the 1997 death of his then-girlfriend. He sought unsuccessfully to reduce the charge to manslaughter in 2001.

His family described him in the lawsuit as a man of faith who avoided trouble in prison. He worked as an auto mechanic and a barber. He earned certificates in Christian studies and computer programming while housed since 1999 at Southern Desert Correctional Center, a mostly medium-security prison in Las Vegas, the lawsuit states.

According to the lawsuit and an unredacted copy of his autopsy obtained by The Associated Press, Walker was experiencing extreme paranoia and had been struggling with losing his train of thought when he was transferred to nearby High Desert State Prison, a mixed-security facility.

It wasn’t long before Walker was “brutally assaulted with batons and sprayed with pepper spray,” causing him to lose consciousness, the lawsuit stated.

Prison staff said Walker had repeatedly ignored commands and showed aggression toward officers, leading them to restrain him with batons and their hands, according to the autopsy.

Walker was taken to a hospital in Las Vegas and struggled to speak. First responders described a slew of injuries in their medical report, including “raccoon eyes” and “uncontrolled bleeding” on his scalp, face and lips, according to the lawsuit.

He was discharged from the hospital four hours later and taken back to the prison, where guards beat Walker with batons a second time the following day, the lawsuit alleges.

Walker was placed alone in a cell in the prison infirmary, a unit where he could be overseen by medical staff, according to the lawsuit. Yet the lawsuit claims that officers and prison medical staff did not check on Walker that night, even as he was “lying in a pool of blood, moaning” under a metal frame bed.

He was dead by morning, found nude, bloodied and unresponsive on the floor.

Along with wrongful death, the lawsuit accuses the corrections department of cruel and unusual punishment against Walker, as well as negligence by the guards and prison medical staff. It also accuses the coroner’s office of deliberate indifference.

The dates of the beatings described in the lawsuit differ slightly from the dates listed in Walker’s autopsy.

James Urrutia, the attorney for Walker’s family, told The Associated Press that the timeline laid out in the lawsuit largely is based on Walker’s medical records and statements from witnesses, including first responders. But he said the full picture of how Walker died isn’t complete because the corrections department has denied the law firm’s repeated requests for security footage and other records.

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Associated Press writer Scott Sonner in Reno, Nevada, contributed to this report. ___

Stern reported from Reno. He is a corps member for the Associated Press/Report for America Statehouse News Initiative. Report for America is a service program that places journalists in local newsrooms. Follow Stern on X: @gabestern326.