The 19-year-old Catholic man gunned down today has been named as Ciaran Cummings.
He was shot dead at the Greystone roundabout in Antrim after being approached by two men on a motorcycle.
He died at the scene.
A friend of the victim's family, Mary Matthews said: "The whole family is devestated."
"They just cannot take it in. He was a normal 19-year-old with plenty of friends from both sides of the community. I don't know why anybody would want to kill him."