Embattled Minnesota Vikings running back Adrian Peterson was investigated for rape near the end of the 2011 NFL season after he participated in a seven-person orgy in an Eden Prairie, Minnesota, hotel room, according to a report. Moreover, one of Peterson’s relatives reportedly used a credit card linked to the football star's All Day Inc. to fund the sexual encounter.

The alleged incident occurred shortly after Peterson signed a seven-year, $100 million contract extension with the Vikings in the fall of 2011, the Minneapolis Star-Tribune reports. The newspaper obtained a 38-page police report that describes how an orgy involving Peterson, two of his relatives – including his younger brother, a minor at the time -- and four unnamed women led to a sexual assault investigation.

The seven individuals spent the night “drinking, arguing and [having] sex” in “various pairs,” the newspaper said. At some point, Peterson, who was engaged to current wife Ashley Brown at the time, got into an argument with one of the women present, who became angry that he was having sex with another woman. The next day, the woman approached police in Hennepin County, in the Minneapolis area, police and accused Peterson of rape.

The allegations against Peterson were reportedly “investigated for months,” with the Vikings running back adamantly professing his innocence. Peterson personally provided evidence to authorities, entering police headquarters through the back door under a hooded sweatshirt. In addition, one of Peterson’s relatives, Chris Brown, later told police that he used an “All Day Inc.” credit card to pay for the Eden Prairie hotel room. Ultimately, Hennepin County prosecutors chose not to press charges against Peterson.

The Star-Tribune’s investigative report also noted that Peterson has fathered at least six children out of wedlock, including two children by two different mothers who were born a month apart in 2010.

Peterson was indicted in September on a charge of reckless or negligent injury to a child after he allegedly beat his 4-year-old son with a switch. If convicted, he faces up to two years in prison and a fine of up to $10,000.

Shortly thereafter, the Vikings placed Peterson, 29, on the exempt/commissioner’s permission list and barred him from participation in any and all team activities. The franchise has not provided a timetable for a potential return.