The Underbelly star, who has previously caused controversy by allegedly attacking ex-girlfriends Rachael Taylor and Brooke Satchwell as well as a Sydney taxi driver in December, has been charged with trespass and resisting police after a rumoured altercation with another patron in a Miami bar at the weekend.
The Telegraph has published documents from Miami Dad County Court stating that Newton's US attorney entered a written not guilty plea on the court record and has also demanded that police give him more detailed information of the incident so that he can prepare a defence.
A police officer known as Hernandez has filled out an official complaint form stating that he saw Newton being "escorted" out of the bar around 4am on Saturday morning. He claimed that the defendant "came back on several occasions after [he] told him to leave".
Newton reportedly received an injury above his eye during the alleged fight with another customer.
Hernandez wrote in his report: "I notice[d] the def[endant] had small scratches on the right side of his face. I ask club security what happen[ed]. He stated def[endant] was involved [in] a fight inside the club... after he started to escort him out he noticed the injur[y]."
Miami Police Department public affairs spokesman Napier Velazquez added that Newton was not violent, but "just resisted a little bit when they were trying to handcuff him".
He said: "Everyone that was involved in the argument, or dispute was asked to leave the restaurant and they all left. And this particular gentleman came back even after being warned not to come back."
It is believed that Newton will insist that he was not drinking alcohol and was not aggressive, despite the fact that the bar's manager described him as a "belligerent drunk".
Newton was believed to be working with Australian documentary maker Alison Thompson before the incident. She said: "He's doing okay, it's just hard with all the press hounding him. He's just a human that needs a lot of help."
The star's Australian lawyer has expressed "extreme concern" that his client could be "suicidal".
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