The man who allegedly beat American football star Adrian Peterson's son to death has been released from jail after posting bail.

Joseph Patterson, 27, was released from Minnehaha County Jail in South Dakota on Tuesday morning (29Oct13) after he pleaded not guilty to second degree murder and two counts of first degree manslaughter on Monday (28Oct13).

Patterson, who is the boyfriend of the dead boy's mother, has also been charged with aggravated battery of an infant and felony child abuse.

He was caring for the Minnesota Vikings star's two-year-old son when the youngster lost consciousness at his apartment on 9 October (13). The child died two days later.