Kristian Gonzalez turned himself in to police around noon on Tuesday.
His attorney implied that Gonzalez has a history of mental or emotional problems which led to the vicious incident.
The heartless 16-year-old who laughed while filming the vicious knockout punch -- and uploaded the shocking video to Facebook.com -- turned himself in over the weekend.
The brutal knockout was filmed in December on a Paterson, NJ street. The victim, who was knocked out cold, apparently didn't contact the police. He was treated at a hospital and released.
Police were alerted to the video on Facebook.com and launched a search for the thugs.
Gonzalez, who was 17 when the punch was thrown, was charged with second-degree aggravated assault and endangering an injured person as a juvenile.
The cameraman will be charged as a juvenile.
— Eyewitness News (@ABC7NY) February 8, 2016