Federal prosecutors announced attempted murder charges against an Arizona inmate Friday, a week after ex-Minneapolis cop Derek Chauvin was stabbed 22 times inside a library at the Tucson penitentiary where they are both inmates.

John Turscak, 52, is also facing multiple assault charges and inflicting serious bodily injury with an “improvised knife” around 12:30 p.m. on Black Friday – a day the suspect allegedly told investigators he picked to symbolize the “Black Lives Matter” movement, which spurred months of protests around the country in connection with the death of George Floyd – who Chauvin was convicted of killing.

Federal corrections officers intervened “immediately” according to court filings, dousing Turscak with pepper spray. He allegedly told the guards he would have killed Chauvin if guards hadn’t reacted so fast. When he waived his Miranda rights, he allegedly told the FBI about the Black Friday symbolism and said he’d planned the attack for a month.

He claimed to have targeted Chauvin solely because he is a high-profile inmate – something prison experts warned was likely to happen.

Turscak could see 60 years added to his federal sentence if he gets the maximum punishment on all of the charges he faces. He was due for release in 2026, according to the Bureau of Prisons.

Authorities told Fox News Digital it is against their policy to give updates regarding inmate health, citing safety and privacy concerns.

Prison staff “isolated and contained” the incident before performing “life-saving measures” on Chauvin, who was treated at a hospital outside the prison.

Read the criminal complaint (Mobile users go here)

In an appeal filed last month, Chauvin claimed new evidence shows he was not responsible for the death. Separately, the Supreme Court rejected his appeal for a new trial just days before the stabbing.

Chauvin is serving a sentence of more than 20 years in prison for the 2020 murder of George Floyd.