Fernando Gonzalez, 27, turned himself in for the attack after police released the video Monday. The New York Daily News reported that Gonzalez's girlfriend and Dunn had previously argued over a laundry cart.
The 17-second-long video shows the suspect holding Dunn down to beat him before spraying him and his daughter with mace.
Police charged Gonzalez with assault.
Celebrity Breakups and divorces of 2014 [PHOTOS]