fate is sealed
(one's) fate is sealed
A particular outcome for one is assured. If the jury comes back with a guilty verdict, then his fate is sealed.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
someone's fate is sealed
Fig. the destiny of somene has been determined. When the driver finally saw that the bridge was out, he knew his fate was sealed.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.