Nineteen year-old believed to have fallen of his own accord
Radio 1 Breakfast Show host replaces Lauren Laverne as presenter
Nine Inch Nails, Green Day and Lou Reed are also on the list of nominees ahead of April 2015 ceremony
Pet Shop Boys also surprise contenders to replace James Corden, say bookmakers
Artist follows Damien Hirst and Sir Peter Blake in designing winners' trophies
Shots to feature in a special digital edition of NME