Green’s Dictionary of Slang

slated adj.

dead.

1895		‘Banjo’ Paterson ‘The Open Steeplechase’ in Man from Snowy River (1902) 73: There was no one next or near me for the field was fairly slated.
1909		J. Ware Passing Eng. of the Victorian Era 226/1: Slated (London Hospital, 19 cent.). To die. Visitors to their relations and friends in hospital are only admitted on certain days – until a patient is doomed, when he is ‘slated’ – that is to say, his name is placed on the doorporter’s slate, in order that his relations and friends may mention his name, and obtain entrance to the hospital at any reasonable hour.