Killer ex-cop Derek Chauvin is out of a hospital and back in the prison where he was stabbed 22 times by a Black Lives Matter-inspired inmate the day after Thanksgiving.

Chauvin, the 47-year-old former Minneapolis cop convicted of murdering George Floyd in 2020, was returned to the Federal Correctional Institution in Tucson, Arizona, despite his family’s fears for his safety there, his attorney, Gregory Erickson, told the Minneapolis Star-Tribune.

“Derek’s family confirmed that his medical condition has improved to the extent that he has been removed from the trauma care facility at a local Tucson hospital and returned to prison custody for his follow-up care,” Erickson said.

Chauvin’s family “is very concerned about the facility’s capacity to protect Derek from further harm” and “they remain unassured that any changes have been made to the faulty procedures that allowed Derek’s attack to occur in the first place,” the attorney said.

John Turscak is charged with attempted murder for the attack on Chauvin, which he said he carried out on Black Friday in symbolic solidarity with Black Lives Matter, the movement that led nationwide police brutality protest after Chauvin’s prolonged caught-on-camera murder of Floyd.

Turscak, who is serving decades in connection with his role in a Mexican Mafia prison gang, allegedly told corrections officers he would have murdered Chauvin with his “improvised knife” if they had not intervened.

Chauvin is serving 23 years after being convicted of second- and third-degree murder and manslaughter in Floyd’s death.

He had appealed his murder convictions, but the US Supreme Court said last month they would not hear his case.

The federal prison was also the site of an attack on USA Gymnastics doctor and serial sexual predator Larry Nassar in 2018.

Nassar was transferred out of the prison before being attacked again in a Florida penitentiary earlier this year.

With Post wires