Séanna Duffy, 19. from Lurgan, died after a car and lorry collided near Lisburn on Sunday.
The collision happened on Saintfield Road near Lisburn on Sunday morning 10:20 BST on Sunday.
Mr Smyth was found shot dead in the living room of his house in Lisburn on 21 June.
Three men from the Republic of Ireland appear in court after shots were fired in Lisburn.
The men aged 24, 30 and 31 were arrested after shots were fired at a flat in Lisburn on Wednesday.