Derek Chauvin, the ex-Minneapolis police officer currently serving jail time in connection with the death of George Floyd, was stabbed 22 times in prison by a “Black Lives Matter” vigilante inmate.

John Turscak, 52, has been charged with attempted murder for allegedly stabbing Chauvin 22 times in the law library at the Federal Correctional Institution in Tucson, Arizona, according to prosecutors.

Prosecutors said that Tursak used an improvised knife and allegedly told authorities he would have killed Chauvin had they not intervened, according to the Associated Press.

Prosecutors claim that Turscak later disclosed to FBI agents that he had been contemplating assaulting Chauvin for approximately one month due to the fact that he is a high-profile inmate, but denied intending to murder him.