Brooks said he was seeking out the off-duty sheriff's deputy serving as set security when Depp found him first.
Depp, who Brooks claims smelled of alcohol, reportedly had to be dragged away by body guards, though the film's director, Brad Furman, claimed that the incident was overblown. Before Rocky could even reach the cops, Johnny attacked him and began screaming "who the f*** are you?"
In the movie, "City of Lies", set for USA release September 7, the 55-year-old Depp plays a Los Angeles police detective who for years investigated the still-unsolved 1997 death of the rapper Notorious B.I.G., also known as Biggie Smalls, whose real name is Christopher Wallace.More news: Trump Presses Germany Spending and EU Trade Deficit Ahead of North Atlantic Treaty Organisation
During an April 2017 shoot in downtown Los Angeles, Brooks said he told Depp that he had only one shot left at completing a scene.
Gregg "Rocky" Brooks - who worked as a location manager on the flick about the murders of The Notorious B.I.G. and Tupac Shakur - claims that Depp, 55, became upset when he told the movie star that they would have to stop filming one night after repeatedly extending their city permit.
Brooks says that the famed actor hired two of his friends for a scene in the flick in April of past year. "I don't give a f - k who you are and you can't tell me what to do!"More news: Kylie Jenner Looks Unrecognisable After Having Lip Fillers Reversed
Johnny apparently punched him twice in the rib cage and then yelled at Rocky: "I will give you $100,000 to punch me in the face right now".
"PLAINTIFF still did not react and DEPP continued to scream and berate him in front of a set full of people until DEPP's own bodyguards physically removed DEPP from the scene". Brooks also claims he was sacked when he refused to sign papers saying he wouldn't sue.
However, despite Depp's legal troubles, a source told ET last month that the actor was "getting his life back on track" after a harrowing couple of years. Depp nor his representatives have issued a comment so far.More news: Donald Trump defends US position against global breastfeeding resolution