The unidentified suspect was arrested on Wednesday.
Authorities released surveillance video footage of the victim identified as "Vivian" walking near Hollywood Boulevard and Vine Street on May 31.
Four young men were seen knocking down and kicking the victim in the video.
The 22-year-old victim was hospitalized for seven days following the attack. She suffered broken bones and internal injuries.
Nicol Shakhnazaryan, 21, of Los Angeles was arrested shortly after the assault. He pleaded not guilty to charges of battery with serious bodily injury and assault in June.
Shakhnazaryan's attorney claims the victim was the aggressor. He faces up to years in prison if convicted.
Police are still searching for two additional suspects.
Anyone with information about the incident was urged to contact detectives at (213) 972-2967.
