Detectives have charged a man in relation to a fatal shooting in Melbourne's north earlier this month, arresting him as he tried to board a flight out of Australia.
Police say the 20-year-old was arrested at Melbourne International Airport shortly before 4am Friday.
The arrest is part of the investigation into a fatal shooting in Thomastown on September 10, when 22-year-old Daniel Hussein was killed in front of friends at HR Uren Reserve in Thomastown.
In video from the night, loved ones could be heard crying and screaming as paramedics tried to revive Mr Hussein, but he died at the scene.
Three men are now facing murder charges over the fatal shooting.
Homicide detectives previously charged brothers Marcus Jajou, 19, and Lucas Jajou, 20, of Donnybrook, with Mr Hussein's murder.
Shortly after the September 10 shooting, relatives said Mr Hussein, a plumber, was engaged to be married and had recently bought a house.
"He had his whole life ahead of him," his brother said at the scene of the shooting earlier this month.
Mr Hussein's uncle, Abdallah Hussein, said he had never imagined he would have to say goodbye to his nephew.
"I still cannot believe you are gone," he wrote on social media in the days after the shooting.
"I still cannot understand that I will never see your smile again, never hear your voice, never watch you walk through that door again."