Intruders forced their way into Brayden Dillon's home and shot the 15-year-old in the head as he lay in bed in Glenfield, in the early hours of April 14 last year.

Abdul Abu-Mahmoud was arrested by police on Thursday morning at Sydney International Airport after coming off a flight from Thailand.

The 33-year-old was charged with murder, refused bail and will appear in Central Local Court on Friday.

Four people have previously been charged over the murder and remain before the courts.

Detectives charged Conrad Craig with the teen's murder last July and later that month - a day after what would have been Brayden's 16th birthday - Sophie Massie was also charged with his murder.

Craig's sister, Kimberly Craig, 35, was charged in September with being an accessory after the fact, knowingly dealing with the proceeds of crime, perverting the course of justice, drug supply and participating in a criminal group.

AAP