A fourth man has been charged with murder after a 16-year-old was killed in a drive-by shooting in Melbourne's inner-north earlier this month. A 20-year-old Heidelberg man was arrested about 11am today in Thomastown, where police seized two shotguns from a property. Ater Good died after he was shot in a drive-by shooting in Fitzroy shortly after midnight on January 3. They include a 19-year-old Heidelberg West man, a 20-year-old Bundoora man and a 21-year-old Heidelberg man, who was arrested at Melbourne Airport. A 20-year-old Heidelberg West man and an 18-year-old NSW man were seriously injured and taken to hospital.