A Florida corrections officer charged with beating an inmate to death already was the subject of 22 use-of-force reports over 10 months, according to a report.

Michael Riley, 27, who faces second-degree murder charges in the June 18 beating death of prisoner Christopher Howell, used force “out of compliance” with department policy in at least two of those cases, the Miami Herald said.

Howell, 51, was being held at the Lake Correctional Institution near Orlando on robbery charges when he refused a command from corrections officers at the time of the assault.

Riley allegedly began beating the handcuffed prisoner while two other officers looked on.

Howell suffered a broken neck and died shortly after the attack.

Riley was indicted on murder charges in the case, authorities said Nov. 10.

“The Florida Department of Corrections has zero tolerance for the malicious application of force,” Florida Secretary of Corrections Mark Inch said in a statement at the time. “If an officer acts outside of their authority and the standards of the department, they will be held accountable.”

But according to the Miami Herald, the department had initially called the fatal beating an “isolated incident” — although records obtained by the newspaper show nearly two dozen other use-of-force incidents before Howell’s death.

With Post wires