An undercover cop has come forward and admitted he was riding with a gang of bikers who beat up a driver and trashed a car in New York City last week, yet did nothing to try stopping the assault.

The off-duty officer witnessed the confrontation and failed to step forward with the information until a few days later. The unidentified detective was doing "his own investigative work" according to the Huffington Post.

The officer has hired an attorney and is being investigated by Internal Affairs.

A third biker was charged this weekend in connection to the SUV gang assault, according to NBC News.

Reginald Chance, 37, of Brooklyn, supposedly used his helmet to bash in the driver's side window of Alexian Lien's Ranger Rover before other bikers dragged him out of the vehicle and started beating him up on Sept. 29.

Chance turned himself over to police and was charged with first-degree gang assault, assault, criminal possession of a weapon, criminal mischief, and unlawful imprisonment, according to the Huffington Post.

Christopher Cruz, 28, of N.J., and Robert Sims, 35, of Brooklyn have also been arrested for their part in gang assault.

Photos were also released this past week confirming that Lien's wife, Rosalyn Ng, was also hurt during the incident.

It was previously believed that Lien's wife and child, who were both in the vehicle during the incident, were not injured. Good Samaritan Sergio Consuegra, who tried helping the family during the assault, said to ABC that one of the biker's grabbed Rosalyn by her arms real until being told to stop by a bystander.

She has hired lawyer Gloria Allred to defend the family, according to a press statement.

"My husband was forced under the circumstances to take the actions that he did in order to protect the lives of our entire family. We know in our hearts that we could not have done anything differently, and we believe that anyone faced with this sort of grave danger would have taken the same course of action in order to protect their family."

Amazingly, some of the bikers feel Lien should be charged, as the entire incident "started" when he hit a motorcycle on the highway and sped away after initially pulling over.

Lien claimed to have pulled away in fear of his life as the gang of motorcyclist were surrounding his vehicle and hitting it.

Police are still investigating video tapes and other evidence to determine who else should be charged. They have already confirmed to NBC New York though that Lien will not be charged and has been cooperating with police since the incident took place.

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