A 42-year-old man was arrested in Nowra about 7.30am yesterday.
He was taken to Nowra Police Station and charged with conceal serious indictable offence of other.
Police will allege the man attended the caravan park with two other men on the night of the alleged murder and subsequently failed to assist investigators following Mr McArthur’s death.
Last month, a 41-year-old man was arrested at a home in Nowra after police executed a search warrant and seized clothing and a vehicle.
He was taken to Nowra Police Station where he was charged with murder, police said.
His arrested came just days after detectives went to a correctional facility at Silverwater and a man was arrested and charged with murder.
Last month, Mr McArthur’s father spoke of the “incredibly tough” months following his son’s death.
“The last three months has been incredibly tough on our family – particularly because we still have no answers on how or why this happened to David,” Stuart McArthur said.
“David was a proud Australian who loved life and was a generous man.
“He didn’t deserve to die,” the grieving father said.