At about 2am on Monday 6 January 2014 police were called to junction 21 of the M60 in Chadderton after someone was seen lying on the slip road.
Officers attended and found a boy, believed to be 16-years-old, was injured.
He was taken to hospital but sadly died a short time later.
The motorway was closed for about two and a half hours while inquiries were made.
There are not believed to be any suspicious circumstances and the matter will be referred to the coroner.