The former Minneapolis police officer charged with murder in the death of George Floyd posted bail on Wednesday and was released from prison.

According to court documents, Derek Chauvin posted $1 million US bond, and the Department of Corrections confirmed he was no longer in custody at the state's facility in Oak Park Heights, where he had been detained.

Floyd, a Black man handcuffed by police who detained him on suspicion of paying with counterfeit bills outside a convenience story in Minneapolis, died May 25 after Chauvin, who is white, pressed his knee against his neck for several minutes as Floyd said he couldn't breathe.

Floyd's death was captured in widely seen bystander video that set off protests around the world. Chauvin and three other officers were fired. Chauvin is charged with second-degree murder and other crimes; Thomas Lane, J. Kueng and Tou Thao are charged with aiding and abetting.

It was not immediately clear where Chauvin got the money to pay his bond. The Minnesota Police and Peace Officers Association, which has a legal defence fund, did not provide any money for bail, a spokeswoman said. A message left with the union representing Minneapolis police officers was not returned.

Chauvin had the option of posting bail for $1.25 million without conditions or $1 million with conditions. Under the conditions of his release, he:

The other three officers previously posted bail amounts of $750,000 US and have been free pending trial. Currently, all four men are scheduled to face trial together in March, but the judge is weighing a request to have them tried separately.