Newark, New Jersey - A video has gone viral of an unidentified United Airlines employee fighting with an ex-NFL player at the airport.

The incident happened at Newark International Airport last Thursday and involved Brendan Langley, a former NFL player who currently plays for The Calgary Stampeders Canadian football team.

The argument was believed to have started over Langley using a wheelchair designated for disabled passengers to handle his luggage, instead of paying $5 for carts offered by the airport.

The longest circulated clip of the incident begins with Langley continuously swinging at the employee.

After a brief pause, the employee smacks the athlete, and Langley responds with two blows that send the employee falling over bags and landing behind a ticket counter.

The employee gets up to go after Langley again, with a bleeding wound on his head, as other employees and passengers yell for them to stop.

It's not clear exactly who started the altercation or who threw the first punch, but Langley maintains his innocence.

TMZ reported that Langley was arrested on charges of simple assault, but the airline employee was not.

Langley took to Twitter to describe his side of the story.

"It's crazy how u can get assaulted by an actual airline employee and defend [yourself], but media will run the narrative that they want to," he stated.

Langley went on to say that he was "begging for help" and "every angle shows me walking away."

The Canadian Football League announced Monday that they are investigating the incident and "looking into the matter in order to learn the full details."

A representative for United confirmed that the employee has been terminated.