Buffalo Bills running back LeSean "Shady" McCoy was accused Tuesday of beating his girlfriend, his son and his dog and using drugs in a graphic Instagram post by the alleged victim's friend.

A friend of Delicia Cordon posted the photo showing the woman with a bloodied face, swollen eyes and multiple cuts. The woman, identified only as Mia, made harrowing allegations against the NFL star.

“@shadymccoy is THE DEVIL!!!! YOU ARE AN ANIMAL!!!!!! We didn’t say anything about how you beat your dog 'Henny' into kidney failure,” the woman wrote. “Let’s not talk about all the times my best friend had to stop you from VICIOUSLY beating your son for small things like peeing in the bed. We kept quiet about your drug usage ... all the ILLEGAL steroids and needles you were using, but we will not keep quiet about this!!!!!!"

She continued: “I can’t believe you did this to my best friend!!!!! YOUR KARMA IS GOING TO BE SO REAL!!!!!! The world needs to know what type of animal you really are!!!!!!! This was just her yesterday on the left and now this morning this is her on the right!!!!”

The photo later was taken down, which the friend later claimed was done at the request of a lawyer.

"I stand by what I said," the post went on to say. "I've personally addressed @leseanmccoy on everything that was stated many many times over the years. Lie to these people if you want shady, but you know I know everything."

McCoy denied the allegations in a statement posted on social media.

In a statement obtained by ABC News, an unidentified firm reportedly representing the alleged victim said that while she was asleep, Cordon "was physically assaulted in the home" she and her kids have lived in with McCoy for more than a year "by a male assailant who entered the home with no signs of forced entry."

"The assailant demanded specific items of jewelry that had been previously gifted to Ms. Cordon by Mr. McCoy, which Mr. McCoy had requested back on many occasions," the statement read. "In fact, after Ms. Cordon refused to return her jewelry gifts to Mr. McCoy, he would often suggest to Ms. Cordon that she could be robbed because the jewelry was expensive."

During the alleged incident, the statement reportedly said Cordon's wrist was injured and the assailant "hit" her "in the face with a firearm multiple times while demanding specific items of jewelry and cash from her."

Cordon's cousin was there at the time as well and was also allegedly hit in the head, the statement to ABC said.

Cordon accused McCoy last year of cheating on her with an escort.

The former University of Pittsburgh star, who rushed for 1,138 yards and six touchdowns last season, was also sued by a woman in 2013 who claimed that he assaulted her before kicking her off a party bus in New Jersey. However, McCoy’s lawyer said at the time no criminal charges were pending and probable cause was never found.

The Bills were aware of the McCoy allegations and were investigating, a source told ESPN.

In a brief statement released on social media, the team said they had talked to McCoy and had "been in contact with the" NFL.

"We will continue to gather information," the team said.